MathLive Changelog

[Unreleased]

Issues Resolved

• When using some APIs such as renderToMarkup() or renderToMathML() in a server-side environment, a runtime error would occur.
• When tabbing in a mathfield with multiple prompts, tab out of the mathfield when the last or first prompt is reached.

0.98.5 2023-12-27

Issues Resolved

• When a font size command is inside a \left...\right command, apply the font size to the content of the command. As a result \frac34 + \left( \scriptstyle \frac12 \right) will now render as expected.

• #2214 When using Linux or Windows with a German keyboard layout, typing the ^ key will now switch to superscript.

• #2214 When typing Unicode characters such as ² or ℂ, correctly interpret them as their LaTeX equivalent. This also affects parsing of the value property.

• #2000, #2063 A mathfield with multiple lines now generate correct LaTeX using the \displaylines command.

• When a superscript or subscript is attached to a function, correctly position a following \left...\right command closer to the function.

• When typing a superscript after f, g or some other function, correctly interpret the superscript as an exponent, not as a function argument.

• #787, #1869 The f, g and h symbols are no longer hardcoded as symbols representing functions.

  Whether a symbol is considered a function affects the layout of a formula, specifically the amount of space between the symbol and a subsequent delimiter such as a parenthesis.

  Now whether a symbol should be treated as a function is determined by the MathfieldElement.isFunction hook.

  By the default, this hook uses the MathfieldElement.computeEngine to determine if the domain of a symbol is a function.

  This can be customized by setting the isFunction property of the mathfield or by declaring a symbol as a function using the declare() method of the compute engine. For example:

  MathfieldElement.computeEngine.declare("f", "Functions");
  

  In addition, a new isImplicitFunction hook has been added which can be used to indicate which symbols or commands are expected to be followed by an implicit argument. For example, the \sin function can be followed by an implicit argument without parentheses, as in \sin \frac{\pi}{2}. This affects the editing behavior when typing a / after the function. If an implicit function, the / will be interpreted as an argument to the function, otherwise it will be interpreted as a fraction with the function as the numerator.

• The “phi” keycap in the virtual keyboard was incorrectly displaying the \varphi symbol. It now displays the \phi symbol.

• #2227 Updating the content of the mathfield with mf.innerText will now correctly update the value of the mathfield.

• #2225 For consistency with <textarea>, when setting the value change the selection to be at the end of the mathfield.

0.98.3 2023-12-07

Improvements

• Improved contrast calculation for the checkmarks over color swatches, now using APCA.

• In some situations, the virtual keyboard would not be displayed when the mathfield was focused and the mathVirtualKeyboardPolicy was set to "auto".

0.98.2 2023-12-06

Improvements

• In some rare cases, the menu was not positioned correctly or would not display at all.

• When dynamically changing the layout of the mathfield, for example when using a font-size attribute based on viewport units, correctly redraw the selection

• Selection while dragging would stop after a few milliseconds

• The “contains highlight” indicator is no longer displayed when the mathfield is not focused or when the indicator is outside of a prompt.

• #2194 Ignore long press events when the pointer is a mouse.

Issues Resolved

• #2195 If the mathfield had a variable width the selection would not be displayed correctly.

• #2190 Under some circumstances, commands selected from the menu could be executed twice.

0.98.1 2023-12-05

New Features

• Added mf.showMenu() method to programmatically show the context menu.

Issues Resolved

• Correctly position the menu when the document has been scrolled.

• When serializing, do not generate a \text command around a \texttt command.

Improvements

• Keyboard navigate submenus with a grid layout

0.98.0 2023-12-03

Breaking Changes

• The mf.setPromptContent() method has been renamed to mf.setPromptValue() for consistency with the mf.getPromptValue() method.

• The mf.stripPromptContent() method has been removed. Its functionality can be achieved with:

const prompts = mf.getPrompts();
const values = prompts.map(id => mf.getPromptValue(id));
prompts.forEach(id => mf.setPromptValue(id, ""));

Improvements

• A new mf.getPromptRange() method returns the selection range of a prompt. This can be used for example to focus a mathfield and select a specific prompt:

mf.focus();
mf.selection = mf.getPromptRange(id);

• The Color, Background Color and Variant menus correctly toggle the colors and variant, and reflect their state with a checkmark or mixedmark.

• Setting the mf.menuItems property before the mathfield is inserted in the DOM will now correctly update the menu items.

• Correctly display tooltips in the menu when invoked via the menu icon.

• Localized menu items in the context menu.

New Features

• #348 Added a placeholder attribute, similar to the placeholder attribute of a <textarea> element. This specifies a short hint as a LaTeX string that describes the expected value of the mathfield. When the mathfield is empty, the placeholder text is displayed. The placeholder text can be styled with the math-field::part(placeholder) CSS selector.

• #2162 Added a "latex-without-placeholders" format to the getValue() method. This format is similar to the "latex" format, but does not include the placeholders (for “fill-in-the-blanks”).

Issues Resolved

• #2169 Changing the selection programatically will now correctly update the mathfield.

• #2189 If the decimal separator is set to ,, the virtual keyboard will now correctly display the decimal separator as a comma.

• #2139 On some keyboard layouts, ALT+/ would insert a \/ command, which is not standard. Now, the simple / is inserted.

0.97.4 2023-11-29

Issues Resolved

• When a global .row class was defined, it would be applied to the virtual keyboard rows, resulting in incorrect layout.

Improvements

• Added mf.queryStyle() method to query the style of a selection or the current style if no selection.

0.97.3 2023-11-28

Improvements

• The mode-change event is now dispatched more consistently when the mode changes.

• When the mathfield loses focus, if some of the content is in LaTeX mode, it remains in LaTeX mode. Previously, it would switch to math mode when losing focus.

• Changing the user-select CSS property before inserting the mathfield in the DOM would not always be respected.

• Use the DOM Popover API when available, which should ensure menus are displayed on top of other elements more consistently.

• Added support for accented characters in the virtual keyboard (press and hold a vowel on an alphabetic keyboard to get accented variants), including a modified AZERTY layout (SHIFT+digits to get common accented characters).

• Improved rendering of the menu for CJK and LTR languages.

Issues Resolved

• If there were multiple mathfield elements on the page, only the last one would display tooltips.

• #2184 Pressing the TAB key when in a prompt (fill-in-the-blank) would not move to the next prompt

• #2183 The MathML serialization of factorial was incorrect.

• #2181 The MathML serialization of limits was incorrect.

0.97.2 2023-11-21

Issues Resolved

• Keybindings for German Linux keyboard layout were not working correctly.

0.97.1 2023-11-20

Issues Resolved

• #2180 Allow the context menu to get turned off by setting mf.menuItems = []

• Fixed a layout issue with the positioning of the context menu in some cases.

• Improved dark mode appearance of context menu

0.97.0 2023-11-20

New Features

• Context Menu Right-clicking on a mathfield or clicking the menu icon next to the virtual keyboard icon will bring up a context menu.

  The keyboard shortcut ALT+SPACE will also bring up the context menu. This keyboard shortcut previously toggled the virtual keyboard. This keyboard shortcut to toggle the virtual keyboard is now ALT+SHIFT+SPACE.

  The menu includes commands to:

  • insert and edit matrixes
  • evaluate, simplify and solve equations
  • change the variant of a symbol (blackboard, fraktur, etc…)
  • change the style (italic, bold, etc…) of the selection
  • change the color and background color
  • insert text
  • copy LaTeX, MathML or MathASCII to the clipboard
  • toggle the virtual keyboard

  The content of the menu may change in future versions, and feedback is welcome.

  The menu can be customized by setting the mf.menuItems property of the mathfield. The value of this property is an array of menu items. See the documentation for details.

Improvements

• The tooltip above the virtual keyboard toggle (and the menu glyph) now only appears after a delay.

Issues Resolved

• The expression \pmod5 is now correctly parsed as \pmod{5}. Macros that used an argument that was not a literal group were not parsed correctly.

0.96.2 2023-11-16

Issues Resolved

• The vertical alignment of formulas containing some fractions was incorrect in some cases.
• #2168 Changing the MathfieldELement.locale or MathfieldElement.strings would not affect existing mathfields.
• Incorrectly accessing static properties (for example using mf.locale instead of MathfieldElement.locale) will now throw an error.
• #2160 The keycap tooltips were not displayed.
• #2144 When smartFence was on, an inline shortcut that conflicted with a delimiter was ignored.

Improvements

• #2141: Added St Mary’s Road symbols for theoretical computer science, including \mapsfrom.
• #2158 Support the German keyboard layout on Linux.
• #2102 The mathfield element now respects the user-select CSS property. If it is set to none, the mathfield will not be selectable.

0.96.1 2023-11-15

Improvements

• Simplified the syntax to modify registers. Use mf.registers.arraystretch = 1.5 instead of mf.registers = {…mf.registers, arraystretch: 1.5}`
• Allow changing registers using \renewcommand, for example \renewcommand{\arraystretch}{1.5}
• Added keycap shortcuts [up] and [down] to move the selection up or down in a matrix.
• Display the environment popover when the selection is inside a matrix, even when the virtual keyboard is not visible.

Issues Resolved

• #2159 Runtime error in sandboxed mode when in an iframe from different origin
• #2175 Addressed some rendering issues with Safar where a fraction inside a \left...\right was vertically offset.
• #2176 Using the [hide-keyboard] virtual keycap would cause a runtime error.
• #2161 When the virtual keyboard is hidden, a geometrychange event is dispatched.

0.96.0 2023-11-14

Breaking Changes

• The function serializeMathJsonToLatex() has been renamed to convertMathJsonToLatex() for consistency.

Issues Resolved

• A closing parenthesis following a function application would be ignored, i.e. (f(x)) would be parsed as (f(x).
• #2116 Pressing the “/” key after an expression ending with a superscript would not recognize the left argument as a numerator.
• #2124 In text mode, some characters were incorrectly interpreted as a math command, for example ( was interpreted as \lparen`. This could cause some interoperability issues.
• #2110 If using the keyboard to enter several macros mapping to an \operatorname command, some of the commands could fail to render. For example, typing “1mm + 2mm” in a mathfield would result in “1 + 2mm” to be displayed.
• When inserting an mchem atom, preserve the verbatimLatex associated with the atom, so that the value property of the atom is correctly serialized.
• When invoking the moveToMathfieldEnd command, the selection was not changed if it was not collapsed and already at the end of the mathfield. Similarly for moveToMathfieldStart.

Improvements

• Added support for additional commands from the mathtools, actuarialangle, colonequals, statmath and amsopn packages
• Added support for longdiv enclosure (\mathenclose{longdiv}{...})
• The decimal separator key (.) in the virtual keyboard was displayed as a blank key.
• #2109 In the virtual keyboard, some placeholders could be hard to see when a keycap was in a pressed state.
• #2105 The keycap shift + in the numeric keyboard was inserting a sum with limits contrary to what the keycap label indicated.
• In the alphabetic virtual keyboard, the , key now produces a semicolon when shifted and has a variant panel with additional punctuation.
• Improved virtual keyboard for integrals with more explicit template
• When removing the limit of an integral or a sum, do not delete the operator itself.
• #2122 On the Virtual Keyboard, the multiplication key now produces \cdot instead of \times. Use shift to produce \times.
• Improved serialization to ASCIIMath and MathML (#2130 and others)
• #2121 For ASCIIMath and MathML serialization, including phantom closing delimiter in the output.
• Pressing the Action keycap on the virtual keyboard with the shift key pressed now inserts a new line (similar to what shift+enter does on a physical keyboard).
• Render \displaystyle and \textstyle to MathML
• Avoid runtime error if the mathfield gets deleted during a selection change event.

0.95.5 2023-08-18

Issues Resolved

• #2091 The variant panel for the 7 key was the variant panel for 4.
• #2093 Inline shortcuts can be corrected with backspace, i.e. typing sen[backspace][backspace]in will be corrected to \\sin.
• #2018 Some VK toolbar items could be offset by a few pixels on some mobile devices
• The caret was not visible when placed after an \operator*{} command
• The \class{}{} command in a mathfield was not working correctly.

Improvements

• #2052 When double-clicking then dragging, the selection is now extended to the nearest boundary. This applies to math, text and LaTeX zones.
• Added prompt CSS part to the mathfield element. This allows styling of prompts (placeholders) in a fill-in-the-blank mathfield.
• Added w40 keycap class (4-wide)
• When using renderMathInElement() preserve the LaTeX as a data- attribute on the element.
• Added speakable text for \imaginaryI, \imaginaryJ, \ne and \neq
• Added ARIA label to keyboard toggle glyph
• More robust check for PointerEvent support
• Throw an error if attempting to access mf.mathVirtualKeyboard. The virtual keyboard is now a singleton, accessible as window.mathVirtualKeyboard.
• When a command attribute is associated with a keycap, a math-virtual-keyboard-command event is dispatched when the keycap is pressed.

0.95.4 2023-08-11

Issues Resolved

• #2090 A runtime error could occur when adding a superscript inside a square root
• #2068 Use a more compact keyboard layout for phones in landscape mode.

Improvements

• #2089 Added x^{#?} in the virtual keyboard variant panel for x
• #2082 The shortcut for \int was triggered with sint. Note that in case of similar conflicts, pressing the spacebar will prevent the shorcuts from taking effect, i.e. “sin t”.

0.95.2 2023-08-09

Improvements

• Added if-math-mode and if-text-mode classes to conditionally show virtual keyboard keys.
• #2086 When navigation a root with an index, the index is now navigater first.

0.95.1 2023-07-25

Improvements

• #2064, #2065 Improved behavior of virtual keyboard shift key, contributed by https://github.com/oscarhermoso

Issues Resolved

• #1995 When right clicking to bring up the variant panel in the virtual keyboard, in some situations the virtual keyboard would lock up.
• #2047 Use \exp instead of \mathrm{exp} in the virtual keyboard
• #2067 When setting up the virtual keyboard policy to "sandboxed" in a cross domain iframe, a runtime error would occur.

0.95.0 2023-07-04

Improvements

• Improved behavior when pressing the tab key
• #2015 New environmentPopoverPolicy option. Set to:
  • "auto" to show environment popover when inside a tabular environment and the virtual keyboard is visible (current behavior)
  • "on" to show it when in a tabular environment
  • "off" to never show it

Issues Resolved

• #2008 The \underline and \overline commands now render correctly.
• #1996, #2025 MathML output could occasionally be incorrect for the
  \left...\right command
• #2009 Chemical equations did not render correctly
• #1990 The closing delimiter of a \left...\right command was incorrectly adopting the style of the last atom inside the command.
• #2044 When overflowing the mathfield using the virtual keyboard, the caret would be hidden from view.
• #2000, #2016 Correctly handle when the root is not a group, i.e. when it’s a multi-line array.

0.94.8 2023-06-15

Improvements

• On RTL system, do not flip the direction of the virtual keyboard keycaps rows

0.94.7 2023-06-08

Improvements

• #1989 Temporarily add back support for iOS versions older than 16.3.

0.94.6 2023-05-25

Issues Resolved

• Only display seletion when the mathfield is focused
• #1985 Add option for output format of getPromptValue()
• #1985 Return Ascii Math output for prompts/placeholders.

Feature

• Pressing the tab key will move to the “next group” in the mathfield, if possible.

0.94.5 2023-05-24

Issues Resolved

• The selection in read only mathfield was no longer visible.

0.94.3 2023-05-22

Improvements

• The mathVirtualKeyboard.layouts property was a frozen array (an array that cannot be modified) but that wasn’t clear. Now, a runtime error is produced if an attempt is made to modify the array. If using Typescript, a compile-time error is also generated.

Issues Resolved

• #1979 Vectors were displayed with an offset
• #1978 Pasting or inserting some content could result in a runtime error
• #1978 Text content was not properly serialized in a \text{} command
• #1682 Vectors (and other accents) are now spoken correctly
• #1981 Adjusting the selection by moving backwards could result in a runtime error.
• #1982 Improved resilience when a mathfield is in an embedded iframe which is not allowed to access the top window by cross-origin policy. In this situation the virtual keyboard is not available, but input via physical keyboard will work.

0.94.2 2023-05-22

Issues Resolved

• #1976 Toggling the virtual keyboard several times would eventually not display the virtual keyboard.
• Only apply smartFence in math mode (not in text or LaTeX mode).
• #1975 When inserting a square root, do not insert an index by default

0.94.1 2023-05-21

Improvements

• Use constructable stylesheets. This results in improved performance and a reduction of memory consuption by 2/3 in a page with 1,000 mathfields.
• Improved MathML serialization (#1870, #1803, #1933, #1648, #737, #150, variants: blackboard, fraktur, bold, etc…).

Issues Resolved

• #1963 Typing a “/” after a digit containing a french decimal (,) did not include the digits before the decimal.

0.94.0 2023-05-18

New Features

• Added support for \raise, \lower and \raisebox commands. Those commands were necessary to render some chemical bonds.
• Pressing (, [ or { with a selection will enclose the selection with this delimiter.

Improvements

• Improved parsing/serialization/rendering of content with a mix of text and math.
• Various rendering improvements, mostly of edge cases.
• Improved behavior of the Shift key in the math keyboard. Single-press the Shift key to set it temporarily, double-press it key to lock it (similar to CapsLock), triple-press it to unlock. This is similar behavior to the ones of mobile virtual keyboards.
• #1647 Improved rendering of chemical bonds, e.g. \ce{ O\bond{~-}H}
• Only on iOS, intercepts the cmd+XCV keyboard shortcut. On other platforms, use the standard cut/copy/paste commands, which do not require user permission.
• The tooltips displayed by the \mathtooltip{} and \texttip{} commands are now displayed when used with a static formula.
• Improvements to smart fence behavior, including better undoability.

Issues Resolved

• Selection display was incorrect when the equation included a colored background.
• Pasing text while in LaTeX mode now works.
• Some of the arrows for mhchem have been renamed and are now displaying correctly
• #1964 Prevent a runtime error when a mathfield is embedded in an iframe and MathLive is not loaded in the host document.
• #1970 The environment popover was not always positioned correctly.
• Correctly return unstyled LaTeX when requested (with format unstyled-latex). This strips any color/background-color/font sizing commands from the ouput.
• The caret is no longer displayed twice when placed after \cos^2 (operators with a superscript).

0.93.0 2023-05-08

New Features

• Support for \the command. For example, \the\year. Its argument can be a literal or a register, preceded by an optional factor literal.
• In addition to the label property, the key property can also now be used for keycap shortcuts. This allow overriding of the shortcut label. For example {key: "[undo]", label: "undo"}
• Added support for --keyboard-row-padding-left and --keyboard-row-padding-right as an option to account for shadows or other decoration that may spill outside the box of a keycap.
• Fixed opacity of Undo button in virtual keyboard, when the button is not applicable.
• The minFontScale property has been added that specifies the minimum font size that should be used for nested superscripts and fractions. The value should be between 0 and 1. The size is in releative em units relative to the font size of the math-field. The default value is 0, which allows the math-field to use its default sizing logic.
• If no mathfield is focused the virtual keyboard will dispatch a keydown/keyup event pair. Add an event listener to the keyboard to receive those events.

Improvements

• Improved performance of creation and destruction of mathfields by 50%.
• Fixed memory and listener leaks. After creating, inserting in the DOM, then removing over 100,000, the memory is back to its starting point and there are no listeners left (except for those associated with the Virtual Keyboard).
• Improved behavior of undo/redo. #1924 works in LaTeX mode. Undo shortcut substitution. Repeated operations (e.g. backspace) are considered a sinle operation for undo/redo purposes.
• Importing the Compute Engine and MathLive in the same projec should no longer trigger a conflict.

Issues Resolved

• #1646 mhchem: states of aggregation is now rendered correctly. Added support for the \mskip command
• When editing a mathfield, after inserting both a superscript and subscript, the subscript would be offset from the superscript.
• #1668 Correctly handle \space, ~
• #1939 When the parent of the Mathfield is scaled, apply the scaling to the selection rectangles
• Fixed parsing of emojis such as 🧑🏻‍🚀
• The focus outline is no longer displayed when in readonly mode
• #1940 New attempt to preserve the focus of mathfields when a window loses, then regains focus (when switching tabs, for example).
• At certain sizes, the \left...\right command did not display the visual indicator that the caret was inside the argument of the command.

0.92.1 2023-04-19

Improvements

• Replaced the (x) ASCIIMath inline shortcut with (*)
• Correctly parse empty sub/superscripts, i.e. x^{}
• Fixed serialization of macros (regression)

0.92.0 2023-04-18

Improvements

• In LaTeX, \not{\in}, \not{}\in and \not\in all render differently. Previously they were all rendered as \not\in. They now render as in LaTeX.
• Removed some unused keybindings, added Desmos Graphing Calculator inline shortcuts, added ASCIIMath inline shortcuts.
• #1920 Added a "sandboxed" mathVirtualKeyboardPolicy which causes the iframe in which the mathfield is to be treated as a top-level browsing context, i.e. to display a virtual keyboard instance in that iframe.
• Added mathVirtualKeycap.actionKeycap, mathVirtualKeycap.shiftKeycap, mathVirtualKeycap.tabKeycap, mathVirtualKeycap.backspaceKeycap to customize the appearance of action keys without having to define new layouts. This can be used to change the “Return” glyph to “Continue” for example, or to use the word “Shift” for the shift key instead of the default shift glyph.
• Added keyboard shortcuts (alt/option+Tab and alt/option+Return) for matrices/environments. Type ( + alt/option+Tab to create 2x1 matrix. If at the root, type alt/option+Return for a multi-line expression.
• Improved LaTeX serialization. Use braces around arguments consistent with LaTeX conventions. Exception is made for single digits for fractions, square roots, superscript and subscript.
• Improved handling of arguments with and without braces. x^\frac12 is now parsed correctly.
• The arraystretch register is now supported to customize the vertical spacing of matrixes and other multi row environments.

Issues Resolved

• When a keybinding conflicts with a composition, cancel the composition. For example, when typing option+U.
• After changing the math keyboard layouts, if there is no layer matching the previously active layer, pick the first available layer.
• When scrolling the mathfield into view after activating the math keyboard correctly account for the position of the keyboard.
• #1914 When the mathVirtualKeyboardPolicy is set to "manual", the keyboard is not hidden, even when losing focus.
• If the last row of a matrix is empty, it is ignored (LaTeX behavior)
• #1929 The \boldsymbol command was serialized incorrectly after its content was modified.
• Ambient style is now applied to macros, so \Huge\mathbb{R} and \Huge\R render identically.
• #1851: Correctly render \not. Fun fact: in LaTeX, \not= renders with a different spacing from \not{=}.
• Correctly render and serialize text (e.g. in \text{} commands) containing non-applicable commands, for example \text{\frac12}.
• When applying a style inside a \left...\right, the style of the closing delimiter should match the style of the last atom before the \right command. For example, with a\left(b\color{red} c\right)d, c and ) should be red.
• Correctly render \middle commands when preceded with a style-changing commands, for example: a\left(b\color{red}\middle| \frac34\right)d
• Work around a Chrome rendering issue with thin lines (fractions, surds)
• Correctly render the gap to the left of \underline, \overline
• #1656 Incorrect \left...\right command after deleting part of the formula.
• #1925 Navigation with the arrow keys could occasionally incorrectly handle atoms that should be treated as a unit, for example \dot{\vec{v}}. In general, various edge cases were not handled correctly.

0.91.2 2023-04-06

Issues Resolved

• Update editing toolbar when virtual keyboard is made visible
• #1919 Correctly position the popover panel above or below the mathfield based on the space available. Allow for more suggestions to be displayed, and include a scrollbar when necessary.

0.91.1 2023-04-05

Issues Resolved

• The context menu that appears on long press on ChromeOS has been disabled as it interfered with long press for variant keys
• When showing the virtual keyboard if the virtual keyboard obscures the mathfield, adjust the position of the mathfield to be visible

0.91.0 2023-04-04

In this release the UI of the virtual keyboards has been significantly updated. This includes new virtual keyboards as well as updated layout for existing virtual keyboards and support for shift key modifier for many keycaps.

Breaking Changes

• The CSS variable --keycap-modifier-background, --keycap-modifier-background-hover, --keycap-modifier-text, --keycap-modifier-border and --keycap-modifier-border-bottom have been renamed --keycap-secondary-background, -keycap-secondary-background-hover, --keycap-secondary-text, --keycap-secondary-border and --keycap-secondary-border-bottom, respectively.
• The custom class on a keycap to indicate a shift key has been renamed from modifier to shift
• The undocument data-shifted and data-shifted-command attributes are no longer supported.
• The classes property in the JSON description of custom layouts has been renamed to labelClass
• The styles property in the JSON description of a custom layer has been renamed to style

New Features

• The JSON description of custom virtual keyboard now support keycap shortcuts. For example the [left] keycap shortcut represent the left arrow key. See the documentation for more details.
• Custom virtual keyboards can now include special keycaps for editing commands (cut/copy/paste/undo).
• The JSON description of custom virtual keyboard keycaps can now include a width property
• The variants panel can be invoked by right-clicking on a keycap.

Improvements

• The default virtual keyboards have been rewritten. They now use the JSON format for their internal description, instead of custom markup.
• The “Functions” virtual keyboard has been merged with the “Symbols” virtual keyboard. Fewer keyboards makes it easier to find the symbol or function you’re looking for.
• The “Numeric” and “Symbols” keyboard now feature a Shift key, doubling the number of symbols accessible from them.
• The variants (accessible with a long press on a keycap) have been streamlined and extended.
• The virtual keyboard now also support pressing the Shift and Caps Lock key on the physical keyboard.
• Three new optional virtual keyboards have been added:
  • minimalist: a small keyboard with only two rows of keycaps containing digits and basic operations.
  • compact: similar layout to minimalist, but the keycaps include variants
  • numeric-only: a keyboard with only digits, the decimal marker and the minus sign. To use them, use mathVirtualKeyboard.layouts = "minimalist"
• Two new CSS variables have been added to control the layout of the virtual keyboard:
  • --keycap-max-width: define the maximum with of a keycap, including its margin
  • --keycap-gap: define the space between keycaps
• The mathVirtualKeyboard.show() function now has an optional argument to animate or not the virtual keyboard. The default is to animate, as per previous behavior.
• When hiding then showing the virtual keyboard, the keyboard will restore the previously selected keyboard layout.
• If loading a web page with a mathfield from a file:// protocol, that is from a local file, the keyboard will now work, as long as the mathfields are in the main document, and not in another browsing context such as an iframe.
• Architectural improvements: the virtual keyboard is now more efficient, uses fewer event handlers and a simplified and lighter weight DOM tree.

Issues Resolved

• On ChromeOS devices with a touch screen, long pressing a keycap in the virtual keyboard no longer triggers the contextual menu.
• The variants keycap work on iOS devices
• The keyboard is correctly offset from the bottom on iOS devices

0.90.11 2023-03-31

Issues Resolveded

• The up and down arrow did not move the cursor, when in a fraction for example.

0.90.9 2023-03-28

Issues Resolveded

• #1890 Attempt to fix a remaining Typescript declaration issue when using MathLive without the Compute Engine

0.90.8 2023-03-27

Issues Resolved

• #1830 The keybinding to toggle text mode (alt+") could not be used on some keyboard layouts. Added shift+alt+T as a keybinding to switch to text mode.
• #1830 In some cases, the placeholder inside an inline shortcut would not get selected when inserted.
• #1890 The Typescript declaration files included references to non-public files. This has been fixed, and some test cases have been added to prevent these errors in the future.
• On iPadOS, making a vertical swipe motion on certain areas of the virtual keyboard would result in a scrolling of the document.

Improvements

• The default originValidator policy which controls the messaging between a mathfield and the virtual keyboard is now "none" by default. This provides no check or validation when sending messages between a main document and embedded iframes. To use the previous, more secure, policy, set the originValidator property of the mathVirtualKeyboard and any mathfield to "same-origin".

0.90.7 2023-03-24

Issues Resolveded

• #1861 In Firefox, an apparently focused mathfield would not always accept keyboard input.

0.90.6 2023-03-23

Issues Resolved

• #1881, #1883 Fixed issues with TypeScript declarations of public interface
• In some cases a horizontal scrollbar would appear in the virtual keyboard
• #1884 mf.setPromptValue() could cause runtime errors
• In some cases, using mf.insert() to replace a selection would do nothing
• Some mathfield properties (for example mf.macros) were missing.

0.90.0 2023-03-19

Breaking Changes

This release contains several breaking changes. As much as possible I try to avoid introducing breaking changes, but there was an accumulation of issues that required some breaking change and I figured I would introduce them all at once:

• the use case where a page had several mathfields was not handled well. Several configuration options were effectively shared, yet each mathfield had its own idea of what the setting was. There were also several duplicate ways of configuring a mathfield, which was confusing.
• the virtual keyboard was awkward to use and configure with multiple mathfields. The virtual keyboard API was also attached to mathfield instances, instead of the virtual keyboard being its own entity.
• Fill-in-the-blank is a popular feature, but its current implementation had some limitations. Thanks to a contributed new implementation, those limitations have been removed, and the API to handle fill-in-the-blank has been adjusted accordingly.

Fill-in-the-blank

• New implementation of the \placeholder{} command for “fill-in-the-blank” feature. Thank you to James Mullen (https://github.com/wildyellowfin) for this contribution.

  Previously, each placeholder was an embedded mathfield inside a “root” mathfield. The placeholders are now special editable regions of a read-only mathfield.

  This improves their layout (for example a placeholder numerator is now displayed at the correct size) and simplify their interaction. When used as a “fill-in-the-blank”, set the mathfield to readonly, and specify an ID with the placeholder, i.e. \placeholder[id]{value}. In this situation these placeholders are called “prompts”.

• The mf.getPlaceholderField() function has been replaced with mf.getPromptValue()

• Use mf.setPromptValue() to change the content of a prompt.

• Use mf.getPrompts() to get an array of the ids of all the prompts in the expression.

• Prompts can be either in a correct, incorrect or indeterminate state. In correct or incorrect state, their appearance changes to reflect their state. Use mf.setPromptState() to flag a prompt as being correct or incorrect. mf.setPromptState() can also be used to mark a prompt as no longer being editable.

Virtual Keyboard

• Previously the virtual keyboard was shared amongst mathfield instances if the makeSharedVirtualKeyboard() function was called or the use-shared-virtual-keyboard attribute was set on a mathfield. Otherwise a virtual keyboard instance was created for each mathfield in the document.

  The virtual keyboard is now always shared.

  The virtual keyboard global instance can be accessed as window.mathVirtualKeyboard or just mathVirtualKeyboard. Its value implements VirtualKeyboardInterface instance, same as was previously returned by makeSharedVirtualKeyboard().

• The options related to the virtual keyboard should now be set on the global shared virtual keyboard, using window.mathVirtualKeyboard instead of on mathfield instances.

• The MathLive virtual keyboard API (offered by the window.mathVirtualKeyboard property) has changed to be consistent with the W3C Virtual Keyboard API.

  This includes adding a show() and hide() functions, and a boundingRect property to VirtualKeyboardInterface.

  A geometrychange event is dispatched when the size of the keyboard changes.

  In addition, the MathfieldElement.virtualKeyboardMode property is now called MathfieldElement.mathVirtualKeyboardPolicy and can take a value of "auto" or "manual".

  A value of "manual" corresponds to the previous virtualKeyboardMode value of "off", that is the virtual keyboard is not displayed automatically and must be displayed programmatically.

  The value "onfocus" is no longer supported. To implement the behavior previously provided by this value:

  mf.addEventListener('focusin', () => mathVirtualKeyboard.show());
  

  If mathVirtualKeyboardPolicy is set to "auto" the virtual keyboard is displayed automatically when a mathfield is focused on a touch-enabled device.

• The virtual keyboard customization API has been simplified.

Before:

const MINIMAL_LAYER = [
  minimal: {
    rows: [
      [
        {latex: "+"}, {latex: "-"}, {latex: "\\times"},
        {latex: "\\frac{#@}{#?}"}, {latex: "="}, {latex: "."},
        {latex: "("}, {latex: ")"}, {latex: "\\sqrt{#0}"},
        {latex: "#@^{#?}"}
      ],
      [
        {latex: "1"}, {latex: "2"}, {latex: "3"}, {latex: "4"},
        {latex: "5"}, {latex: "6"}, {latex: "7"}, {latex: "8"},
        {latex: "9"}, {latex: "0"},
      ]
    ]
}];

const MINIMAL_KEYBOARD = {
  'minimal': {
    label: 'Minimal',
    layer: 'minimal',
  },
};

mf.setOptions({
  customVirtualKeyboardLayers: MINIMAL_LAYER,
  customVirtualKeyboards: MINIMAL_KEYBOARD,
  virtualKeyboards: 'minimal',
});

Now:

mathVirtualKeyboard.layouts = {
  rows: [
    [
      '+',
      '-',
      '\\times',
      '\\frac{#@}{#?}',
      '=',
      '.',
      '(',
      ')',
      '\\sqrt{#0}',
      '#@^{#?}',
    ],
    ['1', '2', '3', '4', '5', '6', '7', '8', '9', '0'],
  ],
};

To change the alphabetic layout:

Before:

mf.setOptions({ virtualKeyboardLayout: 'azerty' });

Now:

mathVirtualKeyboard.alphabeticLayout = 'azerty';

• The "roman" virtual keyboard is now called "alphabetic"

• The virtualKeyboardToolbar option is now mathVirtualKeyboard.actionToolbar

• The virtualKeyboardContainer option is now mathVirtualKeyboard.container

• The virtual keyboard toggle glyph can no longer be customized.

• The virtual keyboard toggle button is displayed by default if the content of mathfield can be modified.

  The display of the toggle button is independent of the mathVirtualKeyboardPolicy.

  Using the math-field::part(virtual-keyboard-toggle) CSS selector, a display: none CSS attribute can be used to hide the virtual keyboard toggle if desired. To replicate the previous default behavior, where the toggle was displayed on touch-enabled devices, use:

  @media not (pointer: coarse) {
    math-field::part(virtual-keyboard-toggle) {
      display: none;
    }
  }
  

• The “alt-keys” of the virtual keyboard are now called “variants”. The data-alt-keys attribute is now data-variants

Options

Previously all the options to configure a mathfield could be changed using mf.setOptions({...}). Some of these options affected a specific mathfield instance, while others affected all mathfields on the page.

The options that affect all mathfields are now static properties of the MathfieldElement global. The options that affect the virtual keyboard are properties of the mathVirtualKeyboard global singleton. The options specific to a mathfield are now properties or attribute of this element.

For example:

Before:

mf.setOptions({ soundsDirectory: null });

Now:

MathfieldElement.soundsDirectory = null;

Miscellaneous Breaking Changes

• For consistency with <textarea> the <math-field> tag now has a default display style of “inline”. You can change the display style to “block” using a CSS rule.
• The <math-field> tag now has some default styling, including a background and border, consistent with a <textarea> element. You can override this styling by defining CSS rules for the math-field selector.
• The previously deprecated option horizontalSpacingScalehas been removed. It is replaced by the standard TeX registers\thinmuskip, \medmuskip and \thickmuskip.
• It was previously possible to specify a set of options for a mathfield as a <script> tag inside the mathfield, as JSON data structure. This is no longer supported.
• It was previously possible to supply a custom style sheet to be applied inside the shadow DOM by using a <style> tag inside the mathfield. This is no longer supported. Use custom CSS variables or part selectors to apply custom styling to the mathfield.

Improvements

• #1854 Attempt to solve multiple reading of field content by screen readers on focus
• #1855 Updated support for more recent versions of SRE (Speech Rule Engine)
• Improved interaction with some screen readers
• #843, #1845 Smarter smart-fence: fewer fence combinations are now valid, resulting in more correct results
• #1859 In math mode, after pressing the SPACE key, the variant style (upright, italic, etc…) from neighboring atoms is not adopted by subsequent characters.
• The disabled and readonly attributes and the user-select CSS property are now consistent with <textarea>:
  • a readonly mathfield is still focusable
  • a disabled mathfield is not focusable
  • The content of a readonly or disabled mathfield can be selected, unless the contenteditable attribute is set to "false" and the user-select CSS property is set to "none". (fixes #1136)
• A mathfield can be used inline, for example inside a <p> element.
• For consistency with a <textarea>, click events are not dispatched when a disabled <math-element> is clicked.
• #1722 The theme applied to the keyboard can be set programmatically by apply a theme attribute to the container of the keyboard, for example <body theme="dark"> or <body theme="light">.
• When a mathfield contains placeholders (or prompts), tabbing at the last placeholder will move to the next focusable element on the page (previously, it would circularly stay inside the current mathfield, with no possibility of escape).

Issues Resolved

• #1850 When multiple \char commands were in an expression, they would all have the same argument when serialized
• #1691 Inserting a left parenthesis to the left of a right parenthesis caused the expression to be incorrectly balanced
• #1858 The spoken representation of the \pm command was incorrect
• #1856 Displaying the virtual keyboard in a custom container was broken
• #1877 Setting options on read-only field was not working
• #1771 Incorrect layout of fill-in-the-blank
• #1770 mf.setValue() did not affect fill-in-the-blank sections
• #1736 Layout issues with fill-in-the-blank
• #1048 Virtual keyboard inside a custom container is now displayed correctly.

0.89.4 2023-02-27

Issues Resolved

• Fix an issue where the virtual keyboard would not activate when not using a shared virtual keyboard.

0.89.3 2023-02-27

Issues Resolved

• #1723 The Ctrl-X/C/V keyboard shortcuts did not trigger when using a touch-capable device with a physical keyboard connected.
• #1834 On Windows, using Firefox with the Swedish keyboard layout, pressing the “¨” or “`” key resulted in a runtime error.
• #1684 The visual state of the Undo button in the virtual keyboard is now correct

Improvements

• Improved layout for the virtual keyboard: automatically increase the size of the keycaps when possible, better adapt to various device layouts.
• When selecting an expression on iPadOS, do not display the OS selection UI
• On iPadOS, account for the safe area at the bottom of the screen when displaying the virtual keyboard.
• Added Cut and Copy commands in the virtual keyboard default action toolbar
• Changed the implementation of the physical keyboard event handling. The same implementation is now used for touch-enabled and non-touch-enabled devices. Instead of an invisible <textarea>, the keyboard events are now captured by a content editable <span>.
• More accurately position the accessory windows of IMEs during composition
• #1843 Work around a WebKit/Safari bug by replicating the inputType property as the data property of "input" and "beforeinput" events. WebKit/Safari erroneously strip the inputType property.

0.89.2 2023-02-17

Improvements

• #1833 MathLive 0.87.0 dropped support for UMD. It turns out, there are some use cases that still require it, sadly. This release should restore the UMD support.
  • As background for this, there are many ways to package a JavaScript library so it can be used in different contexts. The modern packaging supported by both the browsers and Node ecosystem is the JavaScript module. Files in the /dist directory with a .mjs extension are packaged as modules and can be used with a JavaScript import statement or a <script type=module> tag.
  • The files with a .js extension are packaged to be used with a regular <script> tag (no type=module). This format is called IIFE and declares a MathLive global variable from which the MathLive API can be accessed.
  • Another convention was in use before the universal support for JavaScript modules, which used a require() API. This was implemented in Node, but also supported by some toolchains, such as WebPack. Unfortunately, some of those older toolchains are still in use and difficult to move away from. In order to support require() the library needs to be packaged using the UMD format. The UMD format is not supported by modern bundling tools, such as esbuild, which is what MathLive uses since 0.87.0. In this release, the support for UMD is re-introduced by implementing it manually in MathLive, rather than relying on the bundler.

0.89.0 2023-02-12

Improvements

• #1150 Deleting the empty numerator or denominator of a fraction now behaves more intuitively. The behavior now matches the Desmos graphing calculator.
• #1806 Support for speaking matrices and other LaTeX environments. Contribution from @androettop. Thanks, Pablo!

Issues Resolved

• #1802 MathML markup for expressions like a(b)^2 was invalid.

0.87.1 2023-01-26

Improvements

• Better MathML serialization of \operatorname{} and \mathrm{}

Issues Resolved

• #1772 Typing / after f(x) will now consider f(x) as the numerator, instead of (x)
• #1797 The result type of makeSharedVirtualKeyboard() was incorrectly specified as a private type.
• #1798 Using a keyboard shortcut with the control or command key would not reset the inline keystroke buffer. As a result, typing s + i + ctrl-6 + n would yield \sin instead of \si^n.
• #1799 Better fix for #1795. Deleting numerator or denominator of a fraction would no longer collapse the fraction.
• #1800 More closely matches the behavior of the textarea element. Only dispatch an "input" event with an inputType of "insertLineBreak" when the user pressed the RETURN or ENTER key. Also dispatch a focusin and focusout event when applicable.

0.87.0 2023-01-20

Improvements

• Removed dependency on jsdom for server-side rendering.
• Switched bundler from rollup to esbuild

Issues Resolved

• #1795 Deleting forward when there is nothing to delete was throwing an exception (introduced in 0.86.1)
• #1763 The “plonk” sound and other accessibility announcements were not dispatched. Also, sounds were not audible the first time they were played.
• #1762 The \smallint command was erroneously displayed as an extensible symbol
• The MathML serialization for superscripts and subscripts was invalid in some cases.

0.86.1 2023-01-18

Issues Resolved

• #1773, #1542: better handling of interaction with the virtual keyboard on touch-based devices (always use PointerEvents to handle interaction with keycaps)
• #1035 Removing the last mathfield element from a page could result in math content rendered with renderMathInElement() to no longer be rendered correctly (the necessary stylesheet was erroneously removed).
• #1791 The “aside” labels in the virtual keyboard were barely visible in dark mode.
• #1726 Deleting the last element of a fraction also deletes the fraction
• #1764 The MathML serialization for superscripts and subscripts was invalid.
• #1790 Annotations from the \enclose command could not be displayed in some cases if the z-index of the expression they decorated had certain values.

0.86.0 2022-12-02

Breaking Changes

• The Compute Engine has been split from MathLive to reduce the package size and improve the TTI (Time To Interactive) metric. The Compute Engine now needs to be loaded separately:

import 'https://unpkg.com/@cortex-js/compute-engine@latest/dist/compute-engine.min.esm.js';

or

import { ComputeEngine } from 'https://unpkg.com/@cortex-js/compute-engine@latest/dist/compute-engine.min.esm.js';

to create custom Compute Engine instances, which can then be associated with a mathfield using mf.setOptions({computeEngine: ce}) or mf.computeEngine = ce.

If the Compute Engine library is not loaded, some functionality of the mathfield will not be available: mf.expression will always return null and cannot be used to change the content of the mathfield, and math-json is not available as a format on the clipboard,

Issues Resolved

• The vertical placement of the superscript after a \left...\right command was incorrect.
• Extensible arrows with superscript or subscript would not serialize the superscript/subscript.
• The fraction line and surd line would not be visible when printing with the “Don’t show image background” option in the print dialog.
• The "placeholder-change" event was not dispatched.

Improvements

• Tweaked the layout of the symbols virtual keyboard to make regular arrows the default, rather than extensible arrows.
• Fill-in-the-blank (placeholder) nested mathfields now line up with the baseline. They also inherit the font-size of their parent container.

0.85.1 2022-11-18

• Updated to Compute Engine 0.11.0

0.85.0 2022-11-15

New Features

• Added support for \mathtip{math}{tip} and \texttip{math}{tip} commands. These commands are also supported by MathJax.
• Added options.enablePopover option which can be set to false to prevent the auto-complete popover from being displayed.
• Changed the layout of the popover to display multiple options at once
• Added the \error{} command which displays its content with a red underline.
• A specific Compute Engine instance can be associated with a mathfield using mf.computeEngine = ce. If none is provided, a default Compute Engine instance is created when necessary. Setting the property to null will prevent the Compute Engine from being used, but the MathJSON format will not be available.

Improvements

• Audio feedback is now using the Web Audio API. Previously, audio feedback was provided using an Audio element, but browsers have limitations to the number of Audio elements which can be instantiated in a page at a time, and this limit is reached surprisingly quickly wiht multiple mathfields on a page.
• The window.mathlive global is now globalThis[Symbol.for("mathlive")]. This is mostly used internally for coordination between mathfields in the same context but it also includes the version property which may be of use for debugging or to report issues.

Issues Resolved

• #1715, #1716: fill-in-the-blank placeholders inside a <math-field> did not inherit the options from their parent container.

0.84.0 2022-10-19

New Features

• When using renderMathInElement or renderMathInDocument to render math content, the math content can now be provided as MathJSON in addition to LaTeX by using a <script> tag with a type of math/json.

<script type="math/json">
  ["Cos", ["Divide", "Pi", 7]]
</script>

Improvements

• The MathfieldElement now has a setter for expression, which allows to set the value of a mathfield to a MathJSON expression.

Issues Resolved

• #1669 Don’t attempt to get the local URL base when using absolute URLs. Allow null as a value for fontsDirectory and soundDirectory to prevent any attempt to resolve these values.

0.83.0 2022-10-02

Improvements

• When navigating with the keyboard from a numerator to a denominator (or any above/below branch), determine the new position of the caret visually, rather than by its index in the subexpression. Contributed by @manstie

• Commands and key bindings to manipulate array/matrix:

  Key Binding	Command
  ctrl/⌘+; ctrl/⌘+RETURN	addRowAfter
  ctrl/⌘+shift+;	addRowBefore
  ctrl/⌘+,	addColumnAfter
  ctrl/⌘+shift+,	addColumnBefore
  ctrl/⌘+BACKSPACE	removeRow
  shift+BACKSPACE	removeColumn

  Contributed by @manstie

• Updated to Compute Engine 0.8

Issues Resolved

• The caret after an environment without fences (e.g. matrix, aligned, etc) would not be displayed.

0.82.0 2022-09-30

Improvements

• Update Compute Engine to 0.7.0

0.81.0 2022-09-28

Improvements

• #1639 When navigating with the keyboard from a cell in a matrix to another cell above or below, the new position of the caret is determined visually so that the caret is approximately in the same horizontal position. Previously, the position was determined by position/index. Contributed by @manstie. Thank you!
• Expose the placeholders property on MathfieldElement to get access to the “fill-in-the-blank” mathfields, i.e. <math-field readonly>f(x)=\placeholder[var1]{x}</math-field>
• Don’t apply smart superscript on big operators (e.g. \sum). Smart superscript moves immediately out of the superscript if the input is a single digit. Works well for, e.g. x^2 but is less desirable with \sum.

0.80.0 2022-09-27

Issues Resolved

• #1540 When changing the readonly or disabled attribute of a mathfield, hide the virtual keyboard if the mathfield had the focus.
• #1641 A read-only mathfield would still accept inline shortcuts.
• #1618 In some cases, on touch-capable devices the OS virtual keyboard would be displayed instead of the virtual keyboard.
• #1620 On devices with a touch screen and a physical keyboard (Lenovo Yoga, Chromebooks), pressing the Enter key would input the string Enter into the mathfield.
• #1631 Hit-testing detection improvements
• #1640 An input event was dispatched when the value of the mathfield was changed programatically.
• #1330 Make MathLive convertLatexToMarkup() usable from Node.js
• #1641 Correctly render units in a chemical equation, e.g. \pu{123 kJ//mol}.
• #1643 Physical units with multiplication are now rendered correctly, e.g. \pu{123 J*s}.

New Features

• #1541 To be notified when the visibility of the virtual keyboard changes and using makeSharedVirtualKeyboard(), listen for the virtual-keyboard-toggle on the object returned by makeSharedVirtualKeyboard():

const k = makeSharedVirtualKeyboard();
k.addEventListener('virtual-keyboard-toggle', (ev) =>
  console.log('toggling ', ev)
);

• The math-mode event is now cancelable (by calling .preventDefault() on the event). This can be used for example to turn off the ability to switch to the LaTeX editing mode:

// Prevent change to LaTeX (or text) mode
mf.addEventListener('mode-change', (ev) => ev.preventDefault(), {
  capture: true,
});

• The command plonk was added. It plays a sound indicating an error, and can associated with a keybinding, or triggered with mf.executeCommand().
• To determine the offset (caret position) in a mathfield given a viewport coordinate, use mf.offsetFromPoint().
• #1641 Support for the \mathchoice command.
• #1643 Support for the \kern, \mkern and \mspace command.

0.79.0 2022-09-06

Breaking Changes

• The onMulticharSymbol handler has been renamed to onInlineShortcut
• The deprecated modelHooks have been removed. Use the corresponding events instead: move-out, focus-out, announce.
• The onModeChange, onReadAloudStatusChange, onBlur, onFocus, onContentWillChange, onContentDidChange, onSelectionDidChange, onUndoStateWillChange, onUndoStateDidChange and onCommit deprecated listeners have been removed. Used the corresponding events mode-change, read-aloud-status-change, blur, focus, beforeinput, input, selection-change, undo-state-change and change.
• The onKeystroke handler has been removed. Instead use mf.addEventListener("keydown",...)
• Improved editing of left-right delimiters:
  • keep leftright atom if only one of its delimiters is removed
  • only hoist body if both delimiters are removed

Improvements

• More inline shortcut patterns are now recognized, which can be useful for more complex multicharacter symbols, e.g. alpha2 -> \alpha_{2}
• Pressing the space bar will flush the inline shortcut buffer, allowing the input of a key combination that would otherwise trigger a shortcut
• #1584 Pressing the spacebar when at the root level now does nothing. Previously it would jump at the end of the expression, which wasn’t very useful and potentially confusing.
• #1585 In some situations, improve the accuracy of the hit testing
• Upconvert unicode characters to corresponding LaTeX command when available
• When a scaling factor is applied to the mathfield or one of its DOM ancestors, correctly scale the selection background accordingly

Issues Resolved

• #1042 Spacing atoms (e.g. \;) are now clickable and selectable
• #1590 Improved selection of content inside tabular environments (matrix, etc…)
• #1591 Improved cursor order when deleting values in fraction when fractionNavigationOrder mode is denominator-numerator.
• #1592 When applying color to some math content, the command \mathcolor would be serialized. The correct command is \textcolor which despite its name is also applicable in math mode.
• #1605 In some cases, clicking on the space between two atoms would not position the caret.

0.78.2 2022-08-18

Features

• #1580 Added support for infix commands \brace and \brack. These commands are provided for improved compatibility with existing LaTeX content, but in general infix commands are not recommended to create new content.

Issues Resolveded

• #1583 Changing the focus programatically could result in subsequent keyboard input being incorrect

• #1581 Added padding to labels below and above extensible arrows (e.g. \xrightarrow)

• The \ce command would not render chemical equations (regression).

0.78.1 2022-08-12

Issues Resolved

• #1570 Multichar symbols (using onMulticharSymbol) would not always be recognized, for example when following a binary operator.

• #1576 regression in 0.78.0: crash when entering Unicode characters with no special mapping, e.g. “°”.

0.78.0 2022-08-11

Breaking Changes

• The way errors are reported has changed.

  Previously a math-error event would be dispatched (or the onError listener would be invoked). This made it difficult to find out when an error no longer applied.

  • font-not-found: If the fonts fail to load, a class of ML__fonts-did-not-load is added to the document’s body.
  • invalid-keybinding: A message is output to the console if a keybinding includes a combination of keys which cannot be performed with the current keyboard layout
  • Other errors are LaTeX syntax errors in the value of the mathfield. There can be more than one such error in a given mathfield. These errors are reported as mf.errors, an array of LatexSyntaxError. This property can be consulted for example during the handler for a change event.

• Inline shortcuts now only apply in math mode. The mode property of InlineShortcutDefinition has been removed.

Improvements

• Internal: introduction of GlobalContext to encapsulate information necessary to parse and render: macro definitions, registers, definition of commands and some optional settings. A mathfield is a GlobalContext, but it is also used when rendering static LaTeX.

• The symbol used to indicate a placeholder (i.e. \placeholder{}) can now be customized with mf.setOptions({ placeholderSymbol: '?' }).

  Some symbols that work pretty well:

  • ■ U+25A0 BLACK SQUARE
  • ▢ U+25A2 WHITE SQUARE WITH ROUNDED CORNERS
  • ⬚ U+2B1A DOTTED SQUARE

• The following CSS variables can be used to control the appearance of the selection:

  • --selection-background-color-focused
  • --selection-background-color
  • --selection-color-focused
  • --selection-color
  • --caret-color

• Spacing commands (e.g. \,) now serialize a space when using the ascii-math format

• #1572 Keyboard events (keyup, keydown, keypress) are now fired more consistently. They can be intercepted by calling preventDefault() during the capture phase.

Features

• #1556 Support for East-Asian fraction navigation, where the denominator is read/written before the numerator. To use East Asian fraction navigation, set the option fractionNavigationOrder to "denominator-numerator".
• Paste in a mathfield can be prevented by listening for a paste event and doing a preventDefault() on it
• #1439 A synthetic click event is now dispatched when a click occurs inside the mathfield.

Issues Resolved

• When using the Chrome Device Toolbar to emulate a mobile device, typing on the physical keyboard resulted in duplicate input.
• #1545 Switching from a tab with a focused mathfield to another tab, then return to the tab with the matfield would lose the focus on the mathfield. The focus is now restored, similarly to what happens with a textarea element
• When repeatedly hiding/showing the virtual keyboard, the virtual keyboard stylesheet would leak in the <header> of the document
• #1564 The keydown events are now propagated for non-printable keys.
• #1561 Last atom in group (atom with skipBoundary property) was skipped when moving forward

0.77.0 2022-07-05

Improvements

• Changed the key on the bottom right of the virtual keyboard from moveToNextPlaceholder (equivalent to Tab key on physical keyboard) to commit (equivalent to Return on physical keyboard). Pressing this key (or the Return key on a physical keyboard) triggers a change event.

Issues Resolved

• #1523 When switching between keyboard layouts the body of the document was getting erroneously enlarged vertically.
• When using makeSharedVirtualKeyboard() if clicking directly on the virtual keyboard toggle of a mathfield that is not focused, the keyboard would be displayed with options that did not match the mathfield (it would have the wrong custom keyboard for example).
• #1537 On Firefox, calling blur() on a <math-field> element resulted in document.activeElement still being set to the mathfield.
• #1544 Allow physical keyboard input to be turned off.

0.76.1 2022-06-29

Issues Resolved

• #1521 Regression In some cases a vertical scrollbar unexpectedly appeared in the mathfield

0.76.0 2022-06-28

Improvements

• In the second argument of the \colorbox command, use \ensuremath when necessary to indicate that the content is math, rather than a mode shift command
• When selecting all the children of a superscript or subscript, consider the superscript/subscript selected as well
• #1041 When pasting textual content, if it can’t be otherwise determined, assume the content to be LaTeX
• Avoid excessive scrolling when bringing the mathfield into view.
• Fonts could get loaded multiple times when the virtual keyboard was displayed or when static math was rendered

Features

• #1335 Added support for the beforeinput and input events from [Input Events Level 1] (https://www.w3.org/TR/input-events-1/).

  While an input event was dispatched before, it did not conform to the InputEvent interface. The input event now includes an inputType property detailing what caused the event to be dispatched, and in some cases a data property.

  The beforeinput event is dispatched before the content of the mathfield is modified and is a cancelable event.

  A pair of beforeinput and input events are also dispatched when content is deleted, with an appropriate inputType value.

  An input event with a inputType property of "insertLineBreak" is dispatched when the Return or Enter keys are pressed.

  This matches more closely the behavior of the <textarea> element.

• Added new latex-unstyled output format. Use it with getValue() to get a LaTeX representation of the mathfield content, without any color or background color styling command

Issues Resolved

• #1489 In some cases, applying a background color, then entering some equations, could result in incorrect LaTeX output
• Correct serialization for \char"0040 4, or in general any command with an unbraced numeric argument followed by an ambiguous decimal or hexadecimal character
• Avoid crashing when deleting a range that overlaps with all the atoms in the root
• #1195 MathML output could be incorrect in some situations involving LaTeX groups followed by a superscript and subscript
• #1120 If a <mathfield> element had some hooks and listeners customized, then was removed from the DOM and reinserted later, the hooks and listener functions would revert to their default implementation
• #1302 Long press on the backspace key of the virtual keyboard would output an error to the console. Long press on the backspace key is now a shortcut to clear the entire mathfield.

0.75.0 2022-06-21

Features

• #970 It is now possible to vertically scroll the content of the mathfield.

Improvements

• If the layout of the page is such that a mathfield would appear behind a virtual keyboard because there isn’t enough space for the virtual keyboard and the mathfield, the height of the page is now adjusted so that both the mathfield and the virtual keyboard are visible (#1358)
• When the virtual keyboard is invoked, if a mathfield was positioned at the bottom of the page, it could get covered with the virtual keyboard and become inaccessible
• When a mathfield is set to a fixed height and it contains content that doesn’t fit vertically, a scrollbar will appear.
• If the content of the mathfield was taller than could fit in the mathfield, typing would not bring the content of the mathfield into view. (#1310)
• When typing or using the virtual keyboard the mathfield would not always scroll into view to become visible (#1173)
• Propagate content change event on paste in text and LaTeX mode
• Added the container and content CSS part to customize the inside of the mathfield.

Issues Resolved

• #1497 On iOS, tapping the edge of the mathfield could bring the native virtual keyboard
• #1456 When multiple mathfields are present in a page, with makeSharedVirtualKeyboard(), calling setOptions() to change the virtual keyboard mode on those mathfields could cause the keyboards to not be shared.
• #1501 The keybindings to get into and out of text mode (shift+quote) work again
• #1517 Text content was not correctly serialized
• #1503 A spurious = character was produced in the serialization of \ne. The MathML and ASCIIMath serialization of \ne were incorrect.
• #1513 Using the virtual keyboard to apply underline or overline to the selection resulted in a placeholder being inserted instead.

0.74.0 2022-06-06

Improvements

• Improved API/workflow to control the behavior of the virtual keyboard when multiple mathfields are displayed in the page.

  In order to get a coordinated behavior between the mathfields, it is now only necessary to call makeSharedVirtualKeyboard().

  The use-shared-virtual-keyboard attribute is now only necessary when using a mathfield in an iframe.

  If the virtual-keyboard-mode attribute of mathfield is set to auto or onfocus, the virtual keyboard will activate and hide automatically. It is no longer necessary to set the mode to off and to listen for focus change event to show/hide the keyboard manually.

  If the virtual keyboard is visible and the focus changes between two mathfields, the virtual keyboard will stay visible (it will not hide with an animation, then get revealed again).

  If changing focus between two mathfields with identical keyboard configurations the keyboard will not blink (previously the keyboard would get destructed and reconstructed, even if its configuration was identical between two mathfields).

Issues Resolved

• #1477 Undo/redo did not generate an input event

0.73.7 2022-05-29

Improvements

• Preferably use serialized atoms for clipboard copy/paste operations. This internal format captures more of the editing state than the LaTeX representation.
• Change the default textual output to clipboard to use $$ as a format indicator.

Issues Resolved

• #1467 Improvements to the Typescript public declarations
• #1475 Copying a formula containing a matrix could render the mathfield unresponsive

0.73.6 2022-05-28

Issues Resolved

• #1466 In LaTeX mode, doing a Select All (cmd+A), then delete would put the mathfield in an inconsistent state
• While in LaTeX mode, doing a Select All (cmd+A) with a partial command followed by an auto-complete suggestion would render the mathfield unresponsive

0.73.4 2022-05-27

Issues Resolved

• Correctly export the Typescript declaration for some static functions.
• When editing a formula that contains a matrix, the formatting of the matrix could change, for example when pasting some content.
• #1465 The bounds of large operators (integral, sum) would not accept any content.
• When setting the background color of an entire equation, the color command would not be generated.
• #1445 Improve the \colorbox command, and other text mode commands, to be more interoperable when they contain math content (use $ and $$ rather than \\( and \\[))
• #1443 On mobile, prevent the focus from changing while the alternate key panel is up

0.73.1 2022-05-24

Issues Resolved

• Using macros without arguments (e.g. \RR) could result in incorrect LaTeX
• The virtual keyboard could become invisible when re-focusing a mathfield
• Typing a , (comma) would be rendered as a . (dot)

0.73.0 2022-05-23

Breaking Changes

• The following attributes of the <math-field> element that were previously boolean attributes are now enumerated attributes.

  A boolean attribute has a value of true if present and false if absent (it’s an HTML standard thing).

  An enumerated attribute has an explicit value, usually a string.

  As a result of this change the default value of some mathfield attributes have changed from false to true.

  • keypress-vibration: "on" | "off" | "" (default "on")
  • remove-extraneous-parentheses: "on" | "off" | "" (default "on")
  • smart-fence: "on" | "off" | "" (default "on")
  • smart-superscript: "on" | "off" | "" (default "on")
  • smart-mode: "on" | "off" | "" (default"off")

If you previously used:

<math-field></math-field>

in order to preserve the same settings, you would now use:

<math-field
  keypress-vibration="off"
  remove-extraneous-parentheses="off"
  smart-fence="off"
  smart-superscript="off"
></math-field>

• The commands \mleft and \mright are no longer generated automatically.

  Previously, when using smart-fence mode, () or \left(...\right), could be replaced with a \mleft(...\mright) command. This was done to ensure the proper spacing of delimiters after a function, e.g. \sin(x). Without it, there is excessive space between the function and the delimiter.

  Now the \left...\right command automatically adjust its left spacing based on the symbol to its left. If the symbol to its left is a function, the spacing will be tighter. Therefore, \mleft...\mright are no longer required, although they are still recognized as valid commands.

  This change was made because not every LaTeX environment recognize the \mleft...\mright commands, and this caused interoperability issues.

New Features

• Comma , as a decimal separator

  The options.decimalSeparator option can be set to . or ,. The default value is . which corresponds to the current behavior.

  When set to ,, pressing the , key on the keyboard will insert a {,} LaTeX string, if in math mode and if before a digit. The LaTeX sequence {,} is traditionally used to correctly typeset the comma and ensure the correct amount of space around it. Without the {}, the , is interpreted as a delimiter and has excessive amount of space around it.

  The virtual keyboard is also changed so that the . key is , instead and also contextually insert a {,} when appropriate.

  A new command insertDecimalSeparator has also been added, which inserts either {,} if in math mode, right after a digit, and when decimalSeparator is set to ",". Otherwise, it inserts a “.”

• Multi character symbols

  The onMulticharSymbol() hook provides an opportunity to recognize multi character symbols and wrap them in an appropriate command.

  For example typing speed [\ \to ] \mathrm{speed}

  While conventionally \mathrm{} is frequently used to denote multicharacter symbols in LaTeX, in some contexts \mathit can also be used, for example using \mathrm to indicate multicharacter function names, but \mathit for multicharacter variable names.

  By default, the hook does nothing and multicharacter symbols are not recognized.

• Support for the \mathnormal{} command, which displays text in italic and includes italic correction. As opposed to \mathit{} which displays text in italic, but without italic correction.

• Correctly handle double-clicking words styled with \mathrm or \mathit

• The appearance of the placeholder symbol has changed to stand out more. Also, the LaTeX generated for the default placeholder is now simply \placeholder{}. The argument of \placeholder{} was always optional, and is still supported. Only the default serialization of the \placeholder{} has changed.

Improvements

• The MathJSON which is exported to the clipboard during copy/cut operations now include the verbatim LaTeX from the mathfield.

Issues Resolved

• When extending the selection backwards over a captureSelection group, do not extend more than necessary
• #1354 Correctly render {,}, which is used for French decimal point. Also correctly handle navigating with the keyboard, that is, handle it as a single character, not a group. Also correctly render it to MathML (as a .).
• The “contains highlight” and selection rectangles would not always account for the children of the expression, for example with \sqrt{\frac12}
• The LaTeX output of subscript or superscripts was incorrect when no value for the superscript/subscript was provided. For example, typing x, ^, right arrow, 2, would incorrectly serialize x^2. It now serializes x^{}2
• Improved parsing and layout of functions with arguments, i.e. \sin\left(x\right). Previously, there would be an excessive amount of white space between the \sin and (. The expression is now correctly interpreted as a function.
• #1459 When using a non-QWERTY physical keyboard layout, creating multiple mathfields could result in the keyboard layout being erroneously reset to QWERTY. This would manifest itself for example by the / keybinding no longer inserting a fraction.
• #1462 When copying and pasting an expression that could not be parsed with the Compute Engine, the resulting pasted content was displayed as an error.

0.72.2 2022-04-30

Issues Resolved

• #1427 An issue introduced in the previous release: the serialization to LaTeX of some functions (e.g. \log) failed.
• Serialization to MathML of subscripts/superscripts was incorrect in some cases
• In Chrome, setting the readonly attribute on mathfield caused the content of the mathfield to be set to empty.
• #1431 AutoRender of static math expressions would not render correctly when using <script type='math/tex; mode=text'>. Auto-render could also fail catastrophically in some cases.
• Cortexjs.io #15 When loading the fonts (and sounds), the origin of the library needs to be resolved to determine the relative location of those files. This was done with a http GET for each font file, which caused the entire library to be redownloaded multiple times. The base URL resolution is now only done once, and with a HEAD request to avoid the download. As a result, getting the MathLive library ready, especially when using a CDN and a slow network, is an order of magnitude faster.

0.72.0 2022-04-18

Issues Resolved

• #1017 Display tooltip over buttons of virtual keyboard button bar
• #1356 In inline mode, the fraction bar appeared too close to the numerator
• #1222, #1024 When multiple \ne commands were entered, older ones would disappear.
• #1013 Cutting the content of the matfield would not work in some cases
• #1149 Improved placement of the horizontal bar above square roots = #1070 The \mod command (and \pmod and \bmod) no longer captures the cursor or allow its content to be selected
• When navigating with the arrow keys backward, if landing on a group atom (e.g. a macro), allow the cursor to be positioned right after the atom.
• In some rare cases (if no keys but keybinding were entered in a mathfield), some keybindings would stop functioning
• #1327 Selecting the expression under a square root also selected the squared root.
• Extending the selection forward when including some atoms such as \operatorname jumped to the end of the expression.
• #1422 Turning off macros would still fallback to default macros.
• #1037 Correctly serialize \mathord, \mathbin, etc…
• #1425 Using the up/down keys to navigate could produce an error in some cases

Improvements

• Use more standard \mathbb{N}, etc… for NN shortcut
• Improved display of command popover when editing raw LaTeX

0.71.0 2022-04-12

Breaking Changes

• Removed the find and replace methods. These methods were difficult to use, since they were based on LaTeX serialization and the mapping from atom to LaTeX is not always intuitive. To replace them it is recommended to extract the MathJSON representation of the value, and manipulate it using the CortexJS Compute Engine.

New Features

• "math-json" can be used as a format for setValue()

Improvements

• #1415 Atoms inside parentheses are now considered as implicit arguments, for example when inserting a fraction.
• #1389 Keyboard navigation inside tabular data (matrices, etc…)
• Documentation: some of the data structures were not publicly exported and did not appear in the documentation (https://cortexjs.io/docs/mathlive/)
• When pasting content that included a double-backslash (e.g. as a row separator) immediately followed by a character, all double-backslash would be interpreted as a single backslash (this allowed pasting LaTeX that had been escaped in JavaScript). However, this caused some legitimate LaTeX to not be interpreted correctly. The double-backslash are no longer “simplified”.

Issues Resolved

• A style applied to a an atom using applyStyle() was not propagated to its children
• #1387 A matrix with an empty cell would result in error messages in the console in some cases

0.70.0 2022-04-05

Features

• Uses new version of Compute Engine for serialization to MathJSON and parsing of LaTeX from MathJSON.

Issues Resolved

• #934 Improved display of the root horizontal bar in some browsers
• #1385 Typing & is correctly interpreted as \\& (and not &)
• #1363 Commands in the \overrightarrow{} family can be deleted
• #1375 Inserting a smartfence which was not followed by some content would trigger some asserts
• Correctly handle deletion of the closing fence of a smartfence
• #1412 Correctly handle insertion of custom macros with executeCommand
• On Windows/Linux with an AZERTY keyboard, the ² (superscript 2) is now handled correctly
• #1362 and #726 Correctly handle backspacing over a multi-character operator, e.g. <=.
• #1366 pointerup events in a mathfield would not bubble
• In Dark Mode, correctly display SVG shapes, such as \overrightarrow{ABC}.

Improvements

• #934 Improved layout of aligned environment by adding missing gap between columns
• Added macros to the command popover
• Improved visual appearance when using dark mode. Also, added more CSS variables to customize the appearance of the mathfield.

0.69.10 2022-02-23

Features

• Support for the \htmlStyle command (feature contributed by @neokazemi)
• Pressing the \ key after a trigonometric function will not include the function in the numerator of the fraction.

Issues Resolved

• #1024 \ne and \neq render correctly (fix contributed by @AceGentile)
• Changes to the read-only attribute are now properly detected (fix contributed by @LuisMesa)
• Boxes in \enclose command render correctly (fix contributed by @Zahara-Nour
• #1357 Alternate (shifted) layers described in the virtual keyboard defined with an object literal would not trigger.

0.69.9 2022-01-06

Features

• Support for Vue 3.x

Issues Resolved

• #1240 After a Select All (or other selection adjusting commands), inserting characters in LaTeX mode may result in unresponsive input.
• The z-index of the virtual keyboard --keyboard-zindex would not always be applied to the keyboard, resulting in some elements overlaping the virtual keyboard in some situations.

0.69.8 2021-11-08

Issues Resolved

• #1146 When the pointer was over a mathfield, using the scrollwheel or scroll gesture to scroll the page was not possible
• #1201 In some cases, the scrim layer (used to display alternate keys in the virtual keyboard) was at the wrong depth
• #951 Fixed production of sup/sub in MathML
• #1174 The virtual-keyboard-toggle event was not dispatched
• #1087 When using the virtual keyboard, the mathfield would not scroll when necessary

Improvements

• Added sounds-directory as list of valid attributes (contributed by @bengolds)
• Improvements to handling of nested mathfields (“fill-in-the-blank”) (contributed by @caleb-flores)
• Use serve-http instead of http-serve for improved Linux compatibility (contributed by @AceGentile)

0.69.7 2021-09-13

New Feature

• #1138 PR#163 “Fill in the blank”

0.69.6 2021-08-31

Improvements

• vue-cli does not support optional chaining (see https://github.com/vuejs/vue-loader/issues/1697) There are workarounds for this, but debugging and fixing this is too difficult for many users. Therefore, sadly, this release rolls back emitting code including optional chaining, despite the fact it’s supported in every targeted browser, until the vue toolchain gets its act together. To be clear MathLive does not use or depend on Vue, but some users are integrating MathLive in projects that do use it, and this is sufficient to break MathLive. It appears that this issue affects also the React toolchain.

• #1125 don’t enable switching to LaTeX mode for read-only mathfields

Issues Resolved

• #1124 when setting the inlineShortcuts options to empty, don’t fallback to the default shortcuts
• #1119 \overarc and the AccentAtom family would not display their accent
• #1115 Clicking in the mathfield when virtual keyboard is displayed closed the keyboard
• #1117 and #1118 Replacing a subset of a mathfield with a pattern that contains the target led to an infinite loop

0.69.5 2021-08-05

Improvements

• When using keybindings or virtual keyboard keys, insert the content in the current math style, rather than forcing display style.

• Correctly handle loading MathLive in a non-browser context (e.g. Node)

• Updated localization strings

0.69.4 2021-06-22

Improvements

• Updated to ComputeEngine 0.4.2 for better parsing of LaTeX.
• When copying or cutting to the clipboard, if the MathJSON parsing fails, ignore the MathJSON and fallback to LaTeX. Previously, if there was a failure during parsing an empty MathJSON expression would be put on the clipboard, which result in subsequent attempts at pasting the content into a mathfield to fail.
• Updated various localizations (contributed by @physedo).

0.69.3 2021-06-10

Improvements

• Added localization for Irish (contributed by @physedo).

Issues Resolved

• #1000 When serializing subscripts and superscripts, serialize the subscript first: \int_0^{\infty} instead of \int^{\infty}_0.
• In some page layouts, the virtual keyboard could be displayed at an incorrect location, or scroll with the page.

0.69.1 2021-06-09

Improvements

• Attempt to fix installation of the npm package on some Windows configurations

0.69.0 2021-06-09

Breaking Changes

• This release requires TypeScript 4.3 or later (the API uses asymmetric getters/setters). If you are using VSCode, you may need to change the version of TypeScript used by the editor for language services (syntax checking). To do so, with a TypeScript file open, click the Typescript version in the bottom bar, then choose “Select TypeScript Version”, then “Use Workspace Version” (see https://code.visualstudio.com/docs/typescript/typescript-compiling#_using-newer-typescript-versions)

• All the default imports have been removed. Instead of

import MathLive from 'mathlive';
MathLive.renderMathInDocument();

use:

import { renderMathInDocument } from 'mathlive';
renderMathInDocument();

If you are not calling a specific MathLive function and just need to use the <math-field> tag, use:

import from 'mathlive';

• The following deprecated functions have been removed: latexToMathML() → convertLatexToMathMl(), latexToSpeakableText → convertLatexToSpeakableText, latexToMarkup() → convertLatexToMarkup(),
• The deprecated revertToOriginalContent functionality has been removed.
• The deprecated overrideDefaultInlineShortcuts property has been removed. Instead, use:

mf.setConfig('inlineShortcuts', {
  ...mf.getConfig('inlineShortcuts'),
  ...newShortcuts,
});

• The following MathField functions have been removed: $setConfig() → setOptions(), getConfig() → getOptions(), $perform() → executeCommand(), $text() → getValue(), $selectedText() → getValue(), $selectionIsCollapsed(), $selectionDepth(), $selectionAtStart(), $selectionAtEnd(), $latex() → getValue()andsetValue(), $el, $insert() → insert(), $hasFocus() → hasFocus(), $focus() → focus(), $blur() → blur(), $select() → select(), $clearSelection() → executeCommand('delete-backward'), $applyStyle() → applyStyle(), $keystroke(), $typedText()

• The makeMathField() function has been removed. Use new MathfieldElement() or the <math-field> tag instead:

// Before
let mf = MathLive.makeMathField(document.createElement('div'), {
  virtualKeyboardMode: 'manual',
});
mf.$latex('f(x) = \\sin x');
document.body.appendChild(mf.$el());

// After
let mfe = new MathfieldElement({
  virtualKeyboardMode: 'manual',
});
mfe.value = 'f(x) = \\sin x';
document.body.appendChild(mfe);

or:

<math-field virtual-keyboard-mode="manual">f(x) = \sin x</math-field>

Improvements

• Added localization for Dutch (contributed by @harrisnl), Bosnian, Croatian, Czeck, Danish, Estonian, Finnish, Icelandic, Norwegian, Portuguese, Serbian, Slovak, Slovenian, Swedish, Turkish (contributed by @physedo).
• The selection can now be set using an offset, i.e. mf.selection = 0 instead of mf.selection = { ranges:[[0, 0]] }.
• Map \cdot to “times” in spoken-text format.
• #994 When using virtualKeyboardContainer, the virtual keyboard is now displayed inside the container. The container should have a position of relative.
• When replacing a placeholder with a LaTeX command in LaTeX mode (by pressing the \ key), remove the \placeholder{} command.
• In spoken text, correctly handle \mathop and \operatorname.

New Features

• The getOffsetDepth() method can be used to query the depth of a specific offset. Use mf.getOffsetDepth(mf.position) for the depth of the current position.
• the onExport() hook provides an opportunity to customize the format exported to the Clipboard.

Issues Resolved

• Actually change the keyboard toggle glyph when changed with setOptions
• Reparse the formula when the macros dictionary is updated
• #971 In some browsers, when mathfield elements are contained in a container with overflow: scroll, the dimensions of the viewport would be incorrectly affected.
• #974 With non-US keyboard layout, always map the “/” key to a fraction.

0.68.1 2021-06-02

Improvements

• Keybindings: keybindings can now be associated with specific keyboard layouts. By default, the keybindings that are specific to the US keyboard layout are no longer applied with other keyboard layouts. This makes it easier to use punctuation with some keyboard layouts and prevent some error messages from being thrown (addresses #962).

• MathML: improved MathML output, especially for formulas with unbalanced delimiters

Issues Resolved

• #969 and #967 Changed the way the build is done so that MathLive does not use MathJSON as a submodule but as a regular npm dependency, and builds correctly even in non-git environments.
• #968 navigating with arrow keys cannot navigate past a macro

0.68.0 2021-05-31

Breaking Changes

#500 MathJSON support. The legacy MASTON/JSON format has been removed.
The MathJSON format is now integrated into MathLive 🚀 🎆 🥳

To get the MathJSON representation of a formula, use mf.getValue('math-json').

The latexToAST() and astToLatex() functions have been replaced by parseMathJson() and serializeMathJson().

import { parseMathJson, serializeMathJson } from 'mathlive';

MathJSON has an extensive API that supports parsing and serializing of custom LaTeX expressions. You can use it to define your own LaTeX “vocabulary” and “grammar” and transform it into MathJSON.

You can also convert MathJSON expressions into several canonical forms, do symbolic computation with MathJSON expressions, for example to compare them, and more.

Learn more at cortexjs.io/math-json/.

New Features

• #952 It is now possible to define variants with keycaps in a custom keyboard. These variants are displayed with a long press on the keycap.
• #955 When navigating with the arrow keys but there is nowhere to go, a move-out event is dispatched (or the lower-level onMoveOutOf hook is invoked, but using the event is recommended). This is an opportunity to handle this situation, for example by changing the focus to another element. To get the default behavior, which is to play a “plonk” sound, do not cancel the event. To prevent the “plonk” sound from playing, use evt.preventDefault(). Note tha previously a focus-out event was dispatched in this case, but since the focus is actually not changed by default, this was incorrect.

Improvements

• The SpeechScope argument of the speak command is now optional.
• Display the keys in the keystroke caption panel (alt/option+shift+K) in chronological order from left to right.
• Do not inject stylesheets or placeholder elements for the popover panel, keystroke caption panel or virtual keyboard until actually needed, which may be never and thus result in a smaller DOM.

Architecture

• The library is now null-safe, i.e. it compiles with the Typescript flag strictNullChecks. This will ensure that the public Typescript declaration file also compile with strictNullChecks if you make use of it in your own project.

Issues Resolved

• #948 The Typescript declaration of set plonkSound() failed when compiled with strictNullChecks.
• When using a mathfield as a web component, the speak command would be inoperative.
• In Chrome/Blink, when a mathfield was in a contentEditable block, inserting a line before the component would make the component crash. Now the component is correctly disconnected, then reconnected and preserves its state across the disconnection.
• #960 Typing “e^pi” would result in e\pi instead of e^\pi. Also, serializing some partial formulas, such as “e^” would result in incorrect LaTeX (e.g. “e”).
• In MathML serialization, 2^3 was not serializing the superscript (#951 ) and subscripts were not serialized for various constructs( #534).

0.67.0 2021-05-21

New Features

• Added \overarc, \underarc, \overparen and \underparen commands.

Improvements

• When replacing a selected range, snapshot in the undo state the collapsed selection before inserting the replacement.

Issues Resolved

• Correctly calculate the padding for enclose atoms (broken in 0.66)
• Setting the keypressSound to null would not turn off the sounds. Setting it to the string "null" did, though.
• An input event would incorrectly bubble out of the mathfield, even in read-only mode.
• When calling getOption(), or when examining a property on MathfieldElement, return the actual value, rather than an object literal that contains the value.
• If the mathlive module was loaded before the <math-field> element was parsed in the document, the attributes of the mathfield would be ignored.

0.66.1 2021-05-21

Issues Resolved

• Revert improvements where the display property of the mathfield would change depending on the default-mode property. This had unintended consequences in some cases. To control the layout of the mathfield, use style="display:inline-block;" instead.
• When using applyStyle(), if a non-RGB color (e.g. "yellow") was used, it would not be applied to the selection.
• When using applyStyle() if the font size was changed, it was always set to font size 1 (tiny).
• Macro packages were incorrectly parsed

0.66.0 2021-05-20

Breaking Changes

• The horizontalSpacingScale option is deprecated. It will be removed in an upcoming version and replaced by the standard TeX registers \thinmuskip, \medmuskip and \thickmuskip.

Improvements

• When the default-mode attribute (or the defaultMode property) of a <math-field> element is set to "inline-math", the element will be displayed as an inline element. Previously, the defaultMode affected the layout of the math content, but the element still behaved as a block.
• renderMathInDocument() now creates a <div> when using Display Style, and a <span> when using Text Style (inline math).

New Features

• #946 Support addding a custom stylesheet to a <math-field> when using the \class command.
• The mathfield options which are reflected as attributes (e.g. virtual-keyboard-mode) are now reflected as a property on the element mf.virtualKeyboardMode as a shortcut to mf.setOptions({virtualKeyboardMode:...}. This also allows to set these properties before the component is connected to the document.
• Added the following attributes to <math-field>: plonk-sound, keypress-sound. Setting them to ‘none’ turn off these sounds.
• Added support for definition of macro packages (see MacroPackageDefinition)
• Added support to selectively expand macro definitions. This avoid expanding common macro definitions (for example from amsmath.sty) when copying/pasting, while still expanding custom macros for improved compatibility.
• Added support for MediaWiki commands:

• \darr
• \dArr
• \Darr
• \lang
• \rang
• \uarr
• \uArr
• \Uarr
• \N
• \R
• \Z
• \alef
• \alefsym
• \Alpha
• \Beta
• \bull
• \Chi
• \clubs
• \cnums
• \Complex
• \Dagger
• \diamonds
• \empty
• \Epsilon
• \Eta
• \exist
• \harr
• \hArr
• \Harr
• \hearts
• \image
• \infin
• \Iota
• \isin
• \Kappa
• \larr
• \lArr
• \Larr
• \lrarr
• \lrArr
• \Lrarr
• \Mu
• \natnums
• \Nu
• \Omicron
• \plusmn
• \rarr
• \rArr
• \Rarr
• \real
• \reals
• \Reals
• \Rho
• \sdot
• \sect
• \spades
• \sub
• \sube
• \supe
• \Tau
• \thetasym
• \weierp
• \Zeta

• Added support for some additional amsmath commands:

• \varGamma
• \varDelta
• \varTheta
• \varLambda
• \varXi
• \varPi
• \varSigma
• \varUpsilon
• \varPhi
• \varPsi
• \varOmega

• Added support for the \displaylimits command

See Supported TeX/LaTeX Commands for more details.

Issues Resolved

• When a mathfield is created, then immediately removed from the document, do not crash. The creation of the mathfield triggered an asynchronous rendering and by the time the rendering was executed the mathfield was no longer valid. This situattion happened when using “tippyjs” and possibly other libraries.
• When a mathfield is read-only, do not display the focus outline.
• #943 When a tooltip for a custom virtual keyboard was provided, the label was set to “undefined”.
• The DVIPS colors were case sensitive, they should be case sensitive. (i.e. LimeGreen is a valid color, Limegreen is not)
• #945 Preserve more aggressively verbatim LaTeX. Also, avoid serializing superfluous spaces in Spacing atoms.
• #770 Correctly handle attaching limits to \int command using the keyboard.
• Return the correct value for the mathfield element when it is not attached yet, even if the output format is not specified.
• Color specified with the rgb() function would not render correctly if the arguments contained some spaces, e.g.rgb ( 255 , 255 , 255 ).

0.65.0 2021-05-14

Breaking Changes

• The substituteTextArea option has been removed. This option was in fact not working so removing it will presumably have no impact.

New Features

• #939 Added access to \underline, \underbrace, \xleftarrow, etc… to the virtual keyboard.

Improvements

• On iPad OS and relevant Windows devices, support the detachable keyboard.
• In LaTeX mode, don’t consider \\ (double-dash, i.e. end of line in tabular mode) as a valid command prefix.
• In LaTeX mode, don’t recommend \{ as a command by default.
• Added \bigstar symbol
• Improved performance of renderMathInDocument() when there are many formulas on the page.

Architecture

• Renamed Span to Box.

Issues Resolved

• When using Firefox on Windows, the layout of the formula could shift by a fraction of a pixel when moving the caret.
• In LaTeX mode with nested expressions, the edited LaTeX was incorrect.

0.64.0 2021-05-09

Breaking Changes

• The FontSize type is now an integer between 1 and 10. It previously was size1, size2, etc… The default font size is 5, the smallest is 1. However, when using applyStyle(), the size can still be specified with size1, etc… The following size values can also be used: tiny, scriptsize, footnotesize, small, normal or normalSize, large, Large, LARGE, huge, Huge.

• Previously, named colors (yellow, red…) mapped to the dvips color set. They can now map to different values to improve their legibility. To ensure that a particular color is used, specify the colors as a hex triplet (#dd2233). See also the colorMap option.

  The following color names are recommended: they will map to values that have been optimized for legibility as a foreground or background color, they cover all the hues of the color circle and have been adjusted to provide similar apparent brightness and intensity:

  • colors: orange, yellow, lime, green, teal, blue, indigo, purple, magenta
  • shades of grey: black, dark-grey, grey, light-grey, white

New Features

• The background of fractions, radicals and parentheses group (\left/\right commands) is now highlighted when they contain the caret. This makes it easier to distinguish some cases when the cursor is at the edge of the element and could be either inside or outside. The appearance of the highliting can be controlled with the --contains-highlight --contains-highlight-background-color CSS variable. Set it to transparent to restore the previous behavior.

• colorMap option. To map a color name such as “yellow” to a custom RGB color, set the colorMap or backgroundColorMap option to a function that takes the color name as an argument and return a matching CSS RGB string. Return undefined to proceed with the default mapping.

• In macro dictionary, added option to expand or not the macro when using the latex-expanded output format (when copying to the clipboard, for example).

• Added the \overunderset{}{}{} command.

• Added the \lparen and \rparen delimiters.

• Added the \mod, \pmod and \bmod commands, defined as macros.

• Added support for dashed column separators in matrix, using “:” in the matrix preamble. See the arydshln package.

• Added support for optional below argument to \stackrel and \stackbin as per the stackrel package

• When using renderMathInDocument() or renderMathInElement(), ASCII Math format can be used. The default delimiters for ASCII Math are "" (backtick) and can be changed with the asciiMath.delimitersoption. To turn off this conversion and revert to the previous behavior, call renderMathInDocument({ asciiMath: null })`

Layout Improvements

• Substantial rewrite of the stacked layout algorithm (fractions, superscripts, etc…). The previous algorithm did not work correctly when mixing absolute sizing commands (\Huge) and relative ones (\scriptstyle) and had various issues and inconsistencies with what TeX produced. The result is now close to TeX.

• Display the placeholder symbol using the caret color.

• Added the --smart-fence-opacity and --smart-fence-color CSS variables.

• In the layout of superscript/subscript and accents, use the correct font metrics for spacing and layout (previously, the font metric for the base size was always used). This may result in very slightly different placement of superscripts, subscripts and limits (but closer to TeX).

• Fixed cases where the inter-atom spacing was incorrect (when spacing atoms or super/subscripts were used with a binary atom, or when some other atom types were used, such as BoxAtom and more).

Clipboard Improvements

• When pasting from the clipboard, recognize text bracketed with \begin{math}…\end{math} or \begin{displaymath}…\end{displaymath} as LaTeX (in addition to $, $$, \[…\] and \(…\) which were recognized before). Also, recognize text that may contain a LaTeX expression surrounded by regular text (i.e. “if $x > 0$”).

• When pasting ASCIIMath, recognize more expression using standard functions such as the trig functions.

• Recognize text content surrounded with “`” (backtick) delimiters as ASCII Math.

• When copying to the clipboard, roundtrip verbatim latex when available, i.e. the content of the clipboard will be exactly what has been pasted in if the formula has not been edited.

Other Improvements

• The default color mapping function now returns different values when used as a line color or as a background color. This improves the legibility of colors. See MathLive Guide: Customizing.

• Paste operations are now undoable.

Architecture

• Avoid generating unnecessary empty span for limits and other constructs.

• Avoid repeating color attributes on child elements by lifting them to an appropriate parent. As a consequence, when a background color is applied it is displayed more uniformly than previously.

• Reduced the size of the font-metrics table.

• Increased the number of automated and static tests.

Issues Resolved

• The size and spacing of fractions in superscript did not match the TeX layout.
• Correctly apply TeX inter-atom spacing rules as per TeXBook p. 270. The spacing of two consecutive binary atoms (e.g. +-) was incorrect, as well as some other combinations.
• Correctly render \sqrt, \placeholder and many other atoms when a mathstyle is applied with commands such as \textstyle, \scriptstyle, etc…
• Correctly render selection rectangle of accent commands (\widehat).
• If a document called renderMathInDocument() and the document contained a mathfield with a value that contained exclusively an environment, the mathfield would not render (the \begin{} would be incorrectly rendered by renderMathInDocument()).
• When using renderMathInElement() or renderMathInDocument() use the same default letterShapeStyle as when using a mathfield, that is, french if the locale is French, tex otherwise.
• Fixed verbatim latex: when the value of the mathfield is set, if it is not modified, getValue('latex') will return exactly what was input.
• Fixed latex output of \exponentialE: when a superscript/subscript was applied to a macro, the latex output would become blank.
• Math characters with a bold italic style were displayed in regular italic.
• An input consisting of only \scriptstyle would crash.
• Allow navigation inside an empty skipBoundary atom.
• After a copy (command/control+C) command, the content of clipboard was incorrect if the end of the selection included some content in text mode.
• When rendering a placeholder in static mode, use a non-breaking space instead of nothing, which helps preserve a more accurate layout in some cases (for example in \sqrt[\placeholder{}}{x}
• Rules (e.g. from \rule{}{}) were not clickable and did not appear selected.
• Correctly roundtrip \char command when using latex-expanded format.

0.63.1 2021-04-24

Issues Resolved

• On the UK QWERTY keyboard, pressing the \ key did not switch to LaTeX mode. This key, although it looks like an ordinary key, is unique to the UK QWERTY keyboard and distinct from the \ on any other keyboard. Its official name is IntlBackslash, while the other, visually identical \ key, is the Backslash key.

0.63.0 2021-04-24

New Features

• #788 Added virtualKeyboardState property to indicate if the virtual keyboard is currently visible or hidden. The property can also be modified to show or hide the virtual keyboard.
• In read-only mode, do not attempt to load the sounds and do not allow the virtual keyboard to be shown.
• Export version (previously available as MathLive.version).
• #199 Added infty and int inline shortcuts.

Issues Resolved

• #708 Pressing on the bottom part of the virtual keyboard keycap did not trigger the key action.
• The asset directory (fonts/sounds) was not properly located in some browsers when using a CDN to load MathLive.
• Correctly focus the mathfield when the virtual keyboard is invoked.

0.62.0 2021-04-23

Improvements

• #794 When a keycap on the virtual keyboard with associated alternate keys is long pressed, the other UI elements on the screen are ignored (a scrim element is inserted behind the panel to capture events).
• On iPad OS prevent the document selection from being altered after long-pressing an alternate key in some cases.

Issues Resolved

• A $$\chi_{13}$$ (0.1em) gap between the nucleus and the above element was missing in OverUnder atoms (\overset, etc…).
• On Safari iOS, correctly display the keyboard toggle glyph.
• #907 When using renderMathInElement() or renderMathInDocument(), formulas containing styling information would get too aggressively coalesced, dropping some styling.
• #910 Fixed an issue introduced in 0.61.0 where some content would not get rendered when calling renderMathInElement() or renderMathInDocument().

0.61.0 2021-04-22

Breaking Changes

• Some format options have been renamed:

  Before	Now
  "spoken-ssml-withHighlighting"	"spoken-ssml-with-highlighting"
  "mathML"	"math-ml"
  "ASCIIMath"	"ascii-math"

  The old spelling is still accepted at runtime but it has been deprecated and you will be removed in a future update.

Improvements

• In many cases, the layout of the formula is closer to the TeX layout.
• Improved performance of hit testing, selection tracking and selection rendering for complex formulas.
• Improved accuracy of hit-testing. Prevent children of elements with a captureSelection flag from being selectable.
• More efficient rendering by generating simpler markup in some cases.
• Dropped woff fonts. This change should be transparent, as all supported browsers support woff2 at this point.
• Apply sizing commands (e.g. \Huge) to math mode. TeX is inconsistent in how it handles those. We choose to always apply them in math mode.
• Added support for dcases environment: like cases but in displaystyle by default.
• Correctly round trip \mbox by avoiding wrapping it with an unnecessary \text command.

New Features

• #898. Setting the plonkSound or keypressSound option to null will suppress sound feedback.
• PR#905. Added option to specify the container of the virtual keyboard. Contributed by Dominik Janković (https://github.com/djankovic). Thanks, Dominik!
• Simplified the specification of virtual keyboards: the keycap class no longer needs to be specified for each keycap.
• The defaultMode property or the default-mode attribute can be set to a value of inline-math to set the mathfield in inline math \textstyle by default.

Issues Resolved

• Fixed LaTeX output of \htmlData, \cssId and \class commands.
• Ignore commands that are only applicable in some modes when they are used in an incorrect mode.
• Fixed styling of some characters, such as the ones from \cdot. The incorrect styling resulted in incorrect measurement and vertical layout of some characters.
• Fixed rendering of \ne, \neq and \not.
• When using renderMathInElement() or renderMathInDocument() do not duplicate the accessible node.
• Correctly display e^x and d/dx in the functions virtual keyboard
• Ensure the correct spacing around fractions.
• In Safari, the fonts would not load. This was a regression due to a change in the behavior of the API to test if a font is loaded. Safari lies and always answer yes (to prevent fingerprinting).
• Correctly parse the \displaystyle, \textstyle, \scriptstyle and \scriptscriptstyle commands: they apply to the commands to their right.
• In a tabular environment (matrix, etc…) \displaystyle applies to the current cell only (not the whole array).
• Moving forward in a group with the skipBoundary flag would not skip it.
• In a sequence of atoms with skipBoundary, only the first one would be skipped.
• In the virtual keyboard, some keycaps in the greek keyboard were displayed with the system font instead of the TeX font.
• The selection rectangle for \int now accounts for the slant of the symbol.
• When using convertLatexToMarkup() or renderMathInDocument() properly wrap the generated atoms in a root atom. Without it, some atoms render differently in static mode than in interactive mode.
• #654 Added ASCII Math output for tabular environments (array, matrix, etc…)
• If the basefont of the mathfield was large (>48px) the virtual keyboard toggle button would not be vertically centered in the field.
• Correctly layout superscripts after \overset (they are adjacent, not over, unlike \overbrace).
• The cases environment should be in inline mode (textstyle) by default.
• Fixed keyboard navigation of \overbrace, \underbrace, etc…

0.60.1 2021-04-13

New Features

• #793. Added ‘%’ inline shortcut

Issues Resolved

• #896. Touch events were not properly detected on FireFox.
• When using the vite bundler, the library location could not be determined correctly. As a result, the assets (fonts and sounds) could not be loaded when in their default location.
• #864 Fixed layout of \enclose{roundedbox} and other variants.
• #822 When using the Vue.js wrapper, the caret would jump to end of input field when typing a character in the middle of the formula
• When changing options with setOptions() avoid changing the selection unless necessary (react-mathlive issue #4).

0.60.0 2021-04-12

Breaking Change

• Renamed getCaretPosition() and setCaretPosition() to get/set caretPoint.

  “Position” refers to where the caret/insertion point is, as an offset inside the expression. These methods return client screen coordinates and the new name better reflect the correct terminology.

• Removed deprecated (April 2019) method enterCommandMode()

• Replaced ignoreSpacebarInMathMode option with mathModeSpace. The ignoreSpacebarInMathMode was accidentally not working (#859). However, the boolean form is problematic as an element attribute (it defaults to true, but element attributes default to false). It has been replaced with mathModeSpace which is more flexible (you can specify which space to use) and doesn’t have the issue of the default boolean value.

New Features

• Support for iframes. Multiple mathfields in a single document but in different iframes can now share a single virtual keyboard. In the main document, use:

  makeSharedVirtualKeyboard({
    virtualKeyboardLayout: 'dvorak',
  });
  

  And in the iframes, use the use-shared-virtual-keyboard attribute:

  <math-field use-shared-virtual-keyboard></math-field>
  

  See examples/iframe for more info.

  Contribution by https://github.com/alexprey. Thanks!

• #555 Support for IME (Input Method Engines) for Japanese, Chinese, Korean and other complex scripts.

• applyStyle() has now more options. Previously it always toggled the style of the selection. Now it can either toggle or set the style, and modify the selection or a specific range.

• #387 find() method to search the fragments of an expression that match a LaTeX string or regular expression.

  For example the following code snippet will add a yellow background to the fractions in the expression:

  mf.find(/^\\frac{[^}]*}{[^}]*}\$/).forEach((x) => {
    mf.applyStyle({ backgroundColor: 'yellow' }, x, {
      suppressChangeNotifications: true,
    });
  });
  

• #387 replace() method to replace fragments of an expression.

  This method is similar to the replace() method of the String class. The search pattern can be specified using a string or regular expression, and the replacement pattern can be a string or a function. If using a regular expression, it can contain capture groups, and those can be references in the replacement pattern.

  The following snippet will invert fractions in a formula:

  mf.replace(/^\\frac{([^}]*)}{([^}]*)}$/, '\\frac{$2}{$1}');
  

• New LaTeX Mode

  This mode replaces the previous Command Mode. While the Command Mode (triggered by pressing the \ or ESC key) was only intended to insert a single LaTeX command (e.g. “\aleph”), the LaTeX Mode is a more comprehensive LaTeX editing mode.

  To enter the LaTeX Mode, press the ESC key or the \ key. While in this mode, a complex LaTeX expression can be edited. Press the ESC or Return key to return to regular editing mode.

  To quickly peek at the LaTeX code of an expression, select it, then press ESC. Press ESC again to return to the regular editing mode.

  To insert a command, press the \ key, followed by the command name. Press the TAB key to accept a suggestion, then the RETURN key to return to regular editing mode (previously pressing the TAB key would have exited the command mode).

• Added soundsDirectory option to customize the location of the sound files, similarly to fontsDirectory.

• Enabled audio feedback by default.

• #707 added support for \begin{rcases}\end{rcases} (reverse cases, with brace trailing instead of leading)

• #730 added new CSS variables to control the height of the virtual keyboard:

  • --keycap-height
  • --keycap-font-size
  • --keycap-small-font-size (only if needed)
  • --keycap-extra-small-font-size (only if needed)
  • --keycap-tt-font-size (only if needed)

• #732 Support for Dvorak keyboard layout

• Synchronize the virtual keyboard layout (QWERTY, AZERTY, etc…) with the physical keyboard layout.

• Added \htmlData command, which takes as argument a comma-delimited string of key/value pairs, e.g. \htmlData{foo=green,bar=blue}. A corresponding data-foo and data-bar DOM attribute is generated to the rendered DOM.

Issues Resolved

• #805: exponent towers did not display correctly
• #857: when a mathfield was in read-only mode, it was still possible to delete a portion of it by pressing the backspace key.
• #818: on iPad OS 14 and later, Safari pretends to be macOS (“Desktop Mode”). This interfered with the handling of the MathLive virtual keyboard.
• The selection in an expression could render incorrectly if it was displayed before the fonts were fully loaded. This situation is now handled correctly and the selection is redrawn when fonts finish loading.
• The typedText selector dropped its options argument. As a result, the sound feedback from the virtual keyboard only played for some keys.
• #697 When using the <math-field> element the command popover did not display correctly.
• Fixed issues with copy/paste. Copying from a text zone will copy the text (and not a latex representation of it). Copy from a LaTeX zone now works.
• #816 Fixed some issues with keybindings on some keyboards, such as Swiss German. The physical keyboard layout was not always recognized, and some keybindings conflicted with each other.

Improvements

• Improved handling of paste commands: if a JSON item is on the clipboard it is used in priority, before a plain/text item.
• It is now possible to type dead keys such as alt+e, and they are properly displayed as a composition (side effect of the fix for #555).
• #807 Support for AZERTY keyboard layout on Linux.

Architecture

• Complete rewrite of selection handling.

  This is mostly an internal change, but it will offer some benefits for new capabilities in the public API as well.

  Warning: This is a very disruptive change, and there might be some edge cases that will need to be cleaned up.

  The position of the insertion point is no longer represented by a path. It is now an offset from the start of the expression, with each possible insertion point position being assigned a sequential value.

  The selection is no longer represented with a path and a sibling-relative offset. It is now a range, i.e. a start and end offset. More precisely, the selection is an array of ranges (to represent discontinuous selections, for example a column in a matrix) and a direction.

  These changes have these benefits:

  • The selection related code is more expressive and much simpler to read and debug
  • The code is also simpler to change so that changes in UI behavior are much easier to implement. There are several open issues that will be much easier to fix now. In particular, the onDelete function now regroups all the special handling when pressing the Backspace and Delete keys.
  • Instead of the esoteric paths, the concept of position as an offset is much easier to explain and understand, and can now be exposed in the public API. Consequently, new functionality can be exposed, such as the find() method which returns its results as an array of ranges. It is also possible now to query and change the current selection, and to apply styling to a portion of the expression other than the selection.
  • The selection is represented as an array of ranges to support discontinuous selections, which are useful to select for example all the cells in the column of a matrix column. This kind of selection was not previously possible.
  • Incidentally this fixes a circular dependency, which was a smell test that there was a problem with the previous architecture.

  On a historical note, the reason for the original implementation with paths was based on the TeX implementation: when rendering a tree of atoms (which TeX calls nodes), the TeX layout algorithm never needs to find the parent of an atom. The MathLive rendering engine was implemented in the same way. However, for interactive editing, being able to locate the parent of an atom is frequently necessary. The paths were a mechanism to maintain a separate data structure from the one needed by the rendering engine. However, they were a complex and clumsy mechanism. Now, a parent property has been introduced in instance of Atom, even though it is not necessary for the rendering phase. It does make the handling of the interactive manipulation of the formula much easier, though.

• Changes to the handling of sentinel atoms (type "first")

  This is an internal change that does not affect the public API.

  Sentinel atoms are atoms of type "first" that are inserted as the first element in atom branches. Their purpose is to simplify the handling of “empty” lists, for example an empty numerator or superscript.

  Previously, these atoms where added when an editable atom tree was created, i.e. in the editor code branch, since they are not needed for pure rendering. However, this created situations where the tree had to be ‘corrected’ by inserting missing "first". This code was complex and resulted in some unexpected operations having the side effect of modifying the tree.

  The "first" atoms are now created during parsing and are present in editable and non-editable atom trees.

• Refactoring of Atom classes

  This is an internal change that does not affect the public API.

  Each ‘kind’ of atom (fraction, extensible symbol, boxed expression, etc…) is now represented by a separate class extending the Atom base class (for example GenfracAtom). Each of those classes have a render() method that generates a set of DOM virtual nodes representing the Atom and a serialize() method which generates a LaTeX string representing the atom.

  Previously the handling of the different kind of atoms was done procedurally and all over the code base. The core code is now much smaller and easier to read, while the specialized code specific to each kind of atom is grouped in their respective classes.

• Unit testing using Jest snapshot

  Rewrote the unit tests to use Jest snapshots for more comprehensive validation.

0.59.0 2020-11-04

Issues Resolved

• #685 Virtual keyboard event listeners were not properly released when the mathfield was removed from the DOM

0.58.0 2020-10-11

New Features

• #225 Added onCommit listener to mf.options. This listener is invoked when the user presses Enter or Return key, or when the field loses focus and its value has changed since it acquired it. In addition, a change event is triggered when using a MathfieldElement. The event previously named change has been renamed to input. This mimics the behavior of <input> and <textarea> elements.

• #225 Changed the keyboard shortcuts to add columns and rows:

  Shortcut	Command
  ctrl/cmd + Return/Enter	addRowAfter
  ctrl/cmd + shift + Return/Enter	addRowBefore
  ctrl/cmd + ;	addRowAfter
  ctrl/cmd + shift + ;	addRowBefore
  ctrl/cmd + ,	addColumnAfter
  ctrl/cmd + shift + ,	addColumnBefore

  Note that Enter/Return no longer create a matrix/vector when inside a parenthesized expression. Use ctrl/cmd + Return/Enter instead.

• Added a commit command to programmatically trigger the onCommit listener change event.

• Added mount and unmount events to MathfieldElement

• The $text() method, which is deprecated, was accidentally prematurely removed. It has been added back.

Issues Resolved

• Inline shortcuts would not always be triggered correctly, for example x=sin → x\sin instead of x=\sin
• The text in tooltip was not vertically centered in narrow layouts (mobile devices)
• #668 Extensible symbols, such as \xrightarrow were incorrectly treated as if they had an invisible boundary, resulting in the cursor being positioned incorrectly when navigating with the keyboard.

0.57.0 2020-10-09

Major New Feature

This release introduce two major new features which will require code changes. For now, the older API remains supported but it will be dropped in an upcoming release.

#665: Web Component

Support for MathfieldElement custom element/web component and <math-field> tag.

The makeMathField() function is still supported, but it will be removed in an upcoming version. You should transition to using <math-field> or MathfieldElement instead.

This transition require the following changes:

1. Create mathfields using MathfieldElement or declaratively

// Before
let mf = MathLive.makeMathField(document.createElement('div'), {
  virtualKeyboardMode: 'manual',
});
mf.$latex('f(x) = \\sin x');
document.body.appendChild(mf.$el());

// After
let mfe = new MathfieldElement({
  virtualKeyboardMode: 'manual',
});
mfe.value = 'f(x) = \\sin x';
document.body.appendChild(mfe);

or:

<math-field virtual-keyboard-mode="manual">f(x) = \sin x</math-field>

2. Use events instead of callbacks

    // Before
    mf.setConfig({ onContentDidChange: (mf) => {
        console.log(mf.$latex())
    });

    // After
    mfe.addEventListener('input', (ev) => {
        console.log(mfe.value);
    });

#667 Modernized Public API

Support for web component is an opportunity to revisit the MathLive public API and modernize it.

The goals are:

• clarity. For example, the $latex() can be used to read or change the content of the mathfield.
• expressiveness. For example, $selectedText() can return the value of the selection, but there is no way to inspect (or save/restore) the selection.
• consistency with web platform APIs when applicable, otherwise following the monaco (VSCode editor) or CodeMirror conventions primarily. As part of this proposal, the APIs of TinyMCE, CKEditor and QuillJS were also considered. For example, the method equivalent to getConfig() is called getOptions() in most Javascript text editor libraries.

Mathfield methods

The following Mathfield methods have been renamed as indicated:

The methods indicated with “n/a” in the After column have been dropped.

Only the new methods are available on MathfieldElement (i.e. when using web components). The Mathfield class retains both the old methods and the new ones to facilitate the transition, but the old ones will be dropped in an upcoming version.

There is also a new selection property on Mathfield and MathfieldElement which can be used to inspect and change the selection and a position property to inspect and change the insertion point (caret).

The getValue() method also now take an (optional) Range, which is the type of the selection property, to extract a fragment of the expression.

Default Exports

While default exports have the benefits of expediency, particularly when converting an existing code base to ES Modules, they are problematic for effective tree shaking. Therefore the default export will be eliminated.

This means that instead of:

import MathLive from 'mathlive';
MathLive.renderMathInDocument();

you will need to use:

import { renderMathInDocument } from 'mathlive';
renderMathInDocument();

The following functions have been renamed:

New Features

• #101: added getCaretPosition() and setCaretPosition()

Improvements

• The Typescript types for Selector has been improved
• The Typescript type for getOptions() (getConfig()) are more accurate
• The “sqrt” inline shortcut now inserts an argument
• Don’t throw an error if the first argument of \enclose is empty
• #591: add upward and downward hooks when navigating out of the mathfield (now also sent as a focus-out event)
• Improved layout of the virtual keyboard on narrow mobile devices (fill the available width).

Issues Resolved

• #198: typing backspace while typing inline shortcuts would prevent the shortcuts from being recognized
• #573: brackets were not properly styled (i.e. color applied to them)
• #543: spurious focus/blur events were dispatched if tabIndex was set to 0 on the mathfield and some area of the mathfield were clicked on. The issue was that with tabIndex="0" the mathfield frame would be focusable and when that happened the focus would correctly switch to the invisible <textarea> element which is normally focused to receive keyboard events, but this generated an incorrect blur event (for the container losing focus) and an incorrect focus event (for the <textarea> gaining focus)
• #599: some characters, for example “ü”, would not be correctly parsed or displayed. Note that technically, those characters are ignored by TeX, but it’s a reasonable behavior nowadays to accept them as input.
• #628: typing “e” repeatedly inside a matrix would corrupt the emitted
• #637: in Chrome, thin lines, such as fraction bars or square root lines would not display at some zoom levels
• The locale was not properly taking into account when it was set manually
• The config.strings property did not reflect the state of the localization strings
• When configs was updated (e.g. new macros added), the content of the mathfield was not properly re-parsed and rendered
• When making the virtual keyboard visible, the mathfield would not be focused
• The virtual keyboard would not display correctly when the mathfield was inside a shadow DOM

Special Thanks

• Thanks to @stefnotch for contributing several of the improvements in this release

0.56.0 2020-08-22

New Features

• Added support for \phantom, \vphantom, \hphantom and \smash[]
• #182 Added support for the mhchem package, with the commands \ce and \pu, to display chemical equations

0.55.0 2020-08-17

New Features

• WebPack issues workaround and font loading configuration

  Follow up to #508. The fonts can now be loaded either statically or dynamically.

  • dynamic loading by default, the fonts will get loaded programmatically when they are needed and the rendering will be deferred until the fonts are available to avoid unnecessary redrawing. Use this technique if you have a simple build/bundle workflow. You can still customize the relative path to the fonts folder using the fontsDirectory configuration option.

  • static loading include the mathlive-fonts.css stylesheet in your page. The loading of this file will trigget the font to be loaded asynchronously by the browser. Use this technique if you are using WebPack or have a build/bundle workflow that renames the font files or in general require the bundler to know about the required assets.

• New packaging options. The distribution files have been split between minified and non-minified version. In the more common cases, the minified version (mathlive.min.js and mathlive.min.mjs should be used). The non-minified version (mathlive.js and mathlive.mjs can be used to help in debugging issues or to apply patches).

Issues Resolved

• The fonts failed to load when loading MathLive using a <script> tag and a CDN. The fonts folder is now resolved correctly with the following configurations:

  - <script> tag and CDN - <script> tag and local file - import and CDN - import and local file

0.54.0 2020-06-24

Issues Resolved

• #490 Firefox does not load fonts There is a bug in Firefox (https://bugzilla.mozilla.org/show_bug.cgi?id=1252821) where the status of fonts is reported incorrectly.

  Implemented a workaround by always loading fonts in Firefox.

• #506 Chrome was outputing a harmless warning about passive event listeners. The warning has been silenced.

• #505 Chrome was outputing a harmless warning about passive event listeners. The warning has been silenced with extreme prejudice.

• #503 Dynamic styles were not applied inside of shadow DOM

0.53.3 2020-06-24

Issues Resolved

• #504 “Spacing is inconsistent after editing”

  The spacing of operators should be adjusted depending on what’s around them: there is less space after a “-” sign when used as an infix operator than there is around a “-” sign used as a prefix operator (i.e. “-4” vs “3-4”).

  The code that was handling this was accounting for it by modifying the type of the element. This worked well enough for static rendering, but for dynamic rendering (i.e. editing), once modified the previous type of the element was lost and could not be restored (i.e. after deleting the atom in front of a “-” sign, the “-” was no longer a binary operator but a regular symbol).

  This is now handled during layout without modifying the type of the element.

• Workaround for a Safari bug where in some cases the caret would not blink.

• #505 More consistent spacing between elements. Previously some Unicode math spacing characters were used. However, these characters are not rendered consistently. Switched to using CSS margins instead.

• The LaTeX generated for a \left command with another command as a fence was lacking a space, e.g. \left\lbracka\right\rbrack instead of \left\lbrack a\right\rbrack

• Smart fence for square brackets was not working correctly.

• Fixed smartmode to avoid converting a decimal point to text when entering, e.g. “314.1576”

• The alt/option+V shortcut now correctly inserts a placeholder in the square root

• The “\arcos” function was incorrectly spelled “\arccos”.

New Feature

• #508 In order to better support some deployment configurations, added a ‘mathlive-fonts.css’ file to the distribution package.

  This is intended to be used by build/bundle environments that have an asset pipeline that can move/rename assets, including the font-files

  Note that this method is not recommended. It will result in some cases where the layout is incorrect until the page is reloaded (especially for formulas using large symbols such as integrals or large parentheses).

  To use it, add the following to the web pages using MathLive:

<link rel="stylesheet" href="dist/mathlive-fonts.css" />

0.53.2 2020-06-10

Issues Resolved

• Adjusted height of square root (there was some extra blank space above)
• Ensure that the ‘dt’ inline shortcut does not trigger when writing “width” (it should only apply in the math mode)
• #492 Typing “/” to insert as fraction when some items were selected would result in an erroneous output.

0.53.1 2020-06-01

Issues Resolved

• In the virtual keyboard, use \scriptstyle to display small symbols
• Better vertical alignment of extensible arrows
• Don’t display a double caret after a \leftright

0.53.0 2020-05-31

Breaking Change / New Feature

• #158 The CSS files mathlive.css and mathlive.core.css have been deprecated and removed from the distribution.

  The necessary CSS is now injected dynamically into the page. This simplifies the use of the library, but also reduces the amount of CSS in the page, potentially improving performance. That’s particularly the case when the virtual keyboard is not used, as the CSS stylesheet for the virtual keyboard is substantial, and it is now injected only when the keyboard is used.

  To transition, you should remove from your code any instance of:

  <link rel="stylesheet" href="mathlive.core.css" type="text/css" />
  <link rel="stylesheet" href="mathlive.css" type="text/css" />
  

  (the path to your CSS file may be different).

  You may need to specify the location of the ‘fonts’ directory. By default, the ‘fonts’ directory is expected to be next to the ‘mathlive.js’, ‘mathlive.mjs’ file. If you need to copy the ‘fonts’ directory to a different location, specify it using the Config.fontsDirectory option. It should be either a relative path or a full URL pointing to the directory that contains the fonts. (Fix for #425)

  You no longer need to manually specify the stylesheets when using renderMathInElement() or renderMathInDocument() either. The necessary stylesheet will get injected in the document as needed. Note that this stylesheet for these functions is smaller than the stylesheet used when the editor is in use. These two functions also gain a property to specify the location of the ‘fonts’ directory, if necessary (by default, the ‘fonts’ directory is expected to be next to the ‘mathlive.js’, ‘mathlive.mjs’ file.)

  In some rare cases, you may have used the CSS stylesheet without the MathLive library, for example, after you may have saved the output of latexToMarkup() to a database and use it to render later in a page. In that case, you would need to use the CSS stylesheet dist/mathlive-static.css, which is suitable for this use case. Note that it does reference a ‘fonts’ folder that may need to be adjusted. By default, the fonts folder should be placed next to the stylesheet. If you need a different location when using the static stylesheet, you will need to modify it.

• #425 Added CSS variable --ML_keyboard-zindex to control the zindex of the virtual keyboard.

• Add support for ^^ and ^^^^ constructs in LaTeX. See TexBook p. 56:

  There’s also a special convention in which ^^ is followed by two “lowercase hexadecimal digits,” 0–9 or a–f. With this convention, all 256 characters are obtainable in a uniform way, from ^^00 to ^^ff. Character 127 is ^^7f.

  XeTeX extends this convention with ^^^^ for four-digit Unicode characters.

• Added support for more TeX primitives, including \string, \csname, \endcsname, \obeyspaces

• Improved the handling of parameters (e.g. #1) to more accurately match the TeX behavior (previously parameters could only substitute for an entire argument, i.e. {#1}). They are now handled by replacing their value with their corresponding tokens.

• Added support for \laplace and \Laplace symbols

Issues Resolved

• #469 The keyboard layout on Linux was not detected correctly, resulting in some keys (such as arrows and backspace) not working correctly.

• Integers in a LaTeX stream would not always be parsed correctly. As per the TeXBook, an integer can be preceded by an arbitrary number of “+”, “-” or whitespace characters, so \char -+ +- "4A is valid and equivalent to \char"4A

• Integers in a latex stream specified with a backtick (“alphabetic constant”) would not be parsed correctly. Now \char`A gives the expected result (A).

• Consecutive whitespace where not always coalesced.

• The bounding box of the initial selection (before the ‘first’ atom was inserted) was incorrect.

• The sizing commands (\huge, \small, \tiny, etc…) should not apply in ‘math’ mode.

0.52 2020-05-23

New Feature

• Support for Trusted Types.

  A new option in Config, createHTML, is called before injecting HTML into the page, providing an opportunity to sanitize the markup according to a policy set by the host

Improvements

• Move some of the Mathematica inspired command (e.g. \differentialD, doubleStruckCapitalN, etc…) to be macros instead of built-in commands. This will allow them to be properly expanded during copy/paste operations for improved interoperability

• When an invalid keybinding is encountered, the onError listener is now invoked with an error code of invalid-keybinding

• Added support for German keyboard layout.

Issues Resolved

• The Undo and Redo button in the virtual keyboard did not change their state appropriately given the state of the undo stack.

• ‘overunder’: The superscript and subscript after an ‘overunder’ atom (e.g. \overbrace) did not display correctly (above or below the brace). The ‘overunder’ atom would also not display correctly if the width of the atom was below a minimal threshold.

0.51.0 2020-05-19

New Features

• #450 Custom keybindings. A keybinding (also called keyboard shortcut) associate a keystroke combination on a physical keyboard with a command. MathLive previously had some built-in keybindings, but now they can be extended or replaced.

  See config.keybindings and Keybinding

• Added setKeyboardLayout() and setKeyboardLayoutLocale() functions to customize the current physical keyboard layout

Improvements

• #461 The array editing commands only worked in math mode. They now apply in text mode as well

• #459: Add a placeholder for incomplete commands, for example entering \frac in command mode

• Added some missing commands: deleteNextChar deleteForward, deletePreviousChar deleteBackward, deleteNextWord, deletePreviousWord, deleteToGroupStart, deleteToGroupEnd, deleteToMathFieldEnd, moveToSubscript, applyStyle, toggleVirtualKeyboard, hideVirtualKeyboard, showVirtualKeyboard

• In some cases, the top of the placeholder character could be cut off

Issues Resolved

• The Read Aloud feature would not work when a Neural Engine AWS voice was used (such as Joana or Matthew)

• In the Vue wrapper, the onKeystroke handler would error

• Styling (applying color, style) was disabled. This also affected mode change (i.e. alt+= to switch between text and math mode)

• After completing a command in command mode (i.e. pressing the return key), the mode did not switch not math mode and remained in command mode.

0.50.8 2020-05-13

Improvements

• The Symbols keyboard is now a top-level keyboard. Previously it was accessible only from the Roman keyboard
• Added some standard LaTeX commands: \inf, \Pr, \liminf, \limsup
• Added inline shortcuts for some commands: sinh, cosh, sec, csc, cot, arcsin, arccos, arctan
• When generating LaTeX output, only insert spaces when necessary (i.e. after commands that are followed by a letter). Conversely, always generate the space when necessary (\rbrack a would generate \rbracka)
• Minor rendering performance improvement

Issues Resolved

• The absolute value character “|” (and other small delimiters) would be displayed in the wrong font (and too small)

• The absolute value key from the virtual keyboard would insert ‘|#@|’

• The ‘sqrt’ key from the virtual keyboard or keyboard shortcut (option+V) would do nothing. The problem affected any inline shortcut or key that included a ‘#0’ argument when there was no selection

• Fixed an issue with long inline shortcuts that could trigger text mode (e.g. ‘arcsin’) and never apply the inline shortcut

• Do not trigger smart mode conversion with arrow keys

• Fixed an issue on iOS 12 and Firefox/Android where the mathfield could not be focused (fix contributed by (https://github.com/beneater)

0.50.7 2020-05-11

• Fix #448: Fix an issue where the “^” keyboard shortcut would not work

0.50.6 2020-05-11

• Fix date stamping of declaration files

0.50.5 2020-05-10

• Fix #311 Before making a build, check the correct version of node and npm are installed
• Make the build system work better on Windows
• Do not update /dist on each push
• When using a UMD module, do not export ‘default’

0.50.4 2020-05-09

Issues Resolved

• Fix #444 The “x^2” key in the virtual keyboard did not work as expected.

Improvements

• Updated the build system to automatically add the lastest entry from the CHANGELOG to the GitHub release note.

0.50.3 2020-05-08

New Features

• Added a MathLive.version string

0.50.2 2020-05-07

Issues Resolved

• Fixed an issue with rendering of MathML

Improvements

• Added additional contextual information to the parser error message. Detect more errors.

Breaking Change

• Renamed config.error to config.onError for consistency with the other listeners.

New Feature

0.50.1 2020-05-06

New Feature

• A new option, config.error can be used to catch errors while parsing LaTeX.

  This is invoked both for the initial content of the mathfield, when the content of the mathfield is changed programmatically, and when the user pastes latex content in the field.

  An error code will indicate the problem encountered, but the parsing will attempt to recover, in keeping with the previous behavior.

Issues Resolved

• Fixed an issue where the alphabetic ‘sans’ keys on the virtual keyboard output blackboard.
• Fixed an issue where the \mleft. and \mright. commands would not be rendered correctly (or propertly converted to ASCIIMath). (https://github.com/benetech/MathShare/issues/1182)

0.50 (May 4, 2020)

Highlights

• Maintenance: Migration to TypeScript
• Maintenance: New math variant (bold, italic, etc…) subsystem matches LaTeX more closely
• Maintenance: Reduced code size
• New feature: Verbatim LaTeX
• New feature: MathField.getConfig()

New Features

• “Verbatim LaTeX”: the LaTeX provided as input (for example with insert()) is preserved as long as it’s not edited. Previously, the LaTeX would be normalized on input, and the output would not match character for character, even though it produced equivalent LaTeX code. For example, extra spaces could be inserted, and the order of subscript and superscript was not preserved.

  Now, the input LaTeX is preserved until editing operations cause it to be modified. This also means that the arguments of macros are never modified (since the macros are not editable) and will be returned exactly as input (they were normalized before).

• New letterShapeStyle configuration setting to control which letters are automatically italicized, according to four popular styles:

  letterShapeStyle	xyz	ABC	αβɣ	ΓΔΘ
  iso	it	it	it	it
  tex	it	it	it	up
  french	it	up	up	up
  upright	up	up	up	up

  (it) = italic
  (up) = upright

  The default letter shape style is auto: if the system locale is “french”, the french style will be used, tex otherwise. The previous behavior was to always use tex style lettershape.

• New MathField.getConfig() method which gives access to the current configuration settings.

  It can be invoked in three different ways:

  • mf.getConfig(): return a MathfieldConfig object will the values for all the configuration options filled-in.
  • mf.getConfig('letterShapeStyle'): return the current value of the letterShapeStyle option
  • mf.getConfig(['smartMode', 'smartFence']): return an object with the values of the smartMode and smartFence filled in.

  Note that getConfig() may return a different value immediately after setConfig() was invoked: getConfig() returns a “resolved” value, so for example:

  mf.setConfig({ letterShapeStyle: 'auto' });
  console.log(mf.getConfig('letterShapeStyle')); // prints 'tex'
  

• An example (examples/test-cases) with some test cases was added, including LaTeX output screenshots for comparison.

• Re-done the font selection sub-system. Internally, it’s now cleaner and easier to follow, and also closer to the LaTeX implementation. In particular, in math mode, the styling directives are exclusive, except for \mathsymbol, which matches the TeX behavior.

• When a character variant (for example using \mathbb) is not available in the font repertoire, convert to Unicode and fallback to the system font. This allows \mathbb{1} to correctly output 𝟙.

• Added support for \ensuremath command

• Added the \imageof ⊷ and \originalof ⊸ symbols

Code Maintenance

Codebase Migrated to Typescript

This does not impact the bundled library, which is still transpiled JavaScript from the TypeScript sources and which can be used either with a JavaScript or TypeScript based project.

The migration did not result in changes to the public API which remains backward compatible with previous versions. However, new declaration files (*.d.ts) for TypeScript are available. They are more detailed (and accurate) than the previous ones which were generated from JSDoc comments.

The migration was done by hand for the entire code base (35 kloc). Type information was provided for all the data structures and function signatures.

While this does not affect the external users of MathLive (the API and functionality remains the same), this has resulted in several bugs being found by the compiler through static analysis. For example, the onUndoStateWillChange() handler was never invoked because of this statement:

if (options && options.onUndoStateWillChange === 'function') {
  options.onUndoStateWillChange();
}

instead of:

if (options && typeof options.onUndoStateWillChange === 'function') {
  options.onUndoStateWillChange();
}

The TypeScript compiler correctly flagged this error.

This migration will make the ongoing maintenance and development of the codebase much easier.

Codebase Refactoring

Concurrently to the migration to TypeScript, and thanks to the increased clarity and confidence brought in with static typing and code analysis tools, the code has been modularized and reorganized as follow. The codebase previously consisted of several large monolithic source files, some of which were in excess of 4,500 loc.

They have been broken up as follow:

• core/atom.js →
  • atom-array.ts
  • atom-accent.ts
  • atom-box.ts
  • atom-enclose.ts
  • atom-genfrac.ts
  • atom-leftright.ts
  • atom-line.ts
  • atom-op.ts
  • atom-overunder.ts
  • atom-surd.ts
  • atom-to-latex.ts
  • atom-utils.ts
  • atom.ts
• core/definitions.js →
  • definitions-accents.ts
  • definitions-enclose.ts
  • definitions-environments.ts
  • definitions-extensible-symbols.ts
  • definitions-functions.ts
  • definitinos-styling.ts
  • definitions-symbols.ts
  • definitions-utils.ts
  • definitions.ts
• core/parser.js →
  • parser.ts
  • modes.ts
  • modes-utils.ts
  • modes-math.ts
  • modes-text.ts
  • modes-command.ts
• editor-mathlist.js →
  • model.ts
  • model-utils.ts
  • model-styling.ts
  • model-smartfence.ts
  • model-selection.ts
  • model-listeners.ts
  • model-insert.ts
  • model-delete.ts
  • model-commands.ts
  • model-command-mode.ts
  • model-array.ts
  • model-array-utils.ts
• editor-mathfield.js →
  • a11y.ts
  • autocomplete.ts
  • commands.ts
  • config.ts
  • speech.ts
  • speech-read-aloud.ts
  • undo.ts
  • mathfield.ts
  • mathfield-virtual-keyboards.ts
  • mathfield-utils.ts
  • mathfield-styling.ts
  • mathfield-smartmode.ts
  • mathfield-render.ts
  • mathfield-pointer-input.ts
  • mathfield-keyboard-input.ts
  • mathfield-commands.ts
  • mathfield-clipboard.ts
  • mathfield-buttons.ts

Again, this is an internal change that will have no impact for external users of the MathLive library, but it will contribute to improving the maintainability and velocity of the project.

Other Code Maintenance

• Updated font binaries
• Rewrote grapheme splitter in TypeScript. As a result, code size reduced by 113Kb (!).
• Switched to jest as a test runner.

Issues Resolved

• Fix #285: The initial content of the mathfield was considered part of the undo stack, that is, typing command+Z before making any editing operations would make the initial content disappear.

• Fix #236: An initially empty field had no visible caret until it had focused, then blurred, then focused again.

• Fix #438: MathLive did not behave correctly when inside a shadow DOM

• Fix #436: When smartFence was on, applying an inline shortcut before the closing parent of a paren group that had been inserted as a pure fence (not a \left\right group) the parens would get (incorrectly) promoted to a \left\right group, and the shortcut would be inserted outside of the paren.

• Fix #435: Virtual keyboard after a JSON-based virtual keyboard would not display correctly.

• Fix #417: The “International Backslash” (labeled >< on a german keyboard) would incorrectly trigger the command mode.

• Fix #416: With smartFence on, braces around a fraction would disappear, e.g. typing “(1/2” would result in “1/2”

• Fix #415: toASCIIMath() would fail when the mathfield was empty

• Fix #393: some characters in a \operatorname command, including - and *, were not displayed correctly (they should display as if in text mode, not in math mode, and the correct glyphs are different between the two modes)

• Fix #395: re-implemented how macros handle their arguments. They would previously parse their argument using the current parseMode. This is incorrect. The parseMode cannot be determined until the macro has been expanded and the arguments substituted. The parsing of the macros arguments is now deferred until after the macro has been expanded. Additionally, it wasn’t previously possible for arguments to macros to contain other arguments. This is now allowed.

• Fix #395 (bis): Properly output LaTeX for macros when using ‘latex’ and ‘latex-expanded’ formats.

• Fixed numerous issues with LaTeX round-tripping. For example, \mathfrak{C}, \boldsymbol{\sin\theta},

• If the \text command included a &, the content following the & would be ignored.

• The align* environment was not handled correctly and displayed an extra gap between columns.

• The math styling commands did not behave properly. For example:
  
  \mathbf{\sin \alpha} + \mathit{\cos \beta} + \mathbf{\tan x} + \boldsymbol{\sin \gamma}

• Related to the above, but worth noting separately, \mathbf{\alpha} should render as normal italic: the \mathbf command does not apply to lowercase greek letters. The command does apply to uppercase greek letters. This is an artifact of the TeX font encoding, but the behavior is preserved for compatibility with TeX.

• The \textcolor command did not apply to large symbols, such as \sum

• Correctly output LaTeX for infix operators such as \atopwithdelims

• Correctly output unicode characters in the astral plane, e.g. \unicode{"1F468}

• Fixed an issue were consecutive calls to set the content of the mathfield could result in some spurious characters inserted at the beginning of the field.

Breaking Change

• The signature of the latexToMarkup() function has changed.
  Instead of a style and format, the second argument is an option object. The style can be specified with a mathstyle property, the format with a format property. A new letterShapeStyle property can also be specified.

  • Before: MathLive.latexToMarkup(formula, 'displaystyle')
  • After: MathLive.latexToMarkup(formula, { mathstyle: 'displaystyle' });

• The ‘command’ virtual keyboard is no longer displayed by default. The layout for this virtual keyboard has been deprecated and will be removed in a future version. This is a partial fullfilment of #270.

• The config.handleSpeak and config.handleReadAloud hooks have been renamed config.speakHook and config.readAloudHook respectively

Deprecated

• The overrideDefaultInlineShortcuts is deprecated (still supported in this version, but will be removed in an upcoming one). Instead, to add to the default shortcuts, use:

mf.setConfig({
  inlineShortcuts: {
    ...mf.getConfig('inlineShortcuts').inlineShortcuts,
    ...newShortcuts,
  },
});

0.35.0 2020-03-24

New Features

• Extensible (stretchy) symbols:

  #126 (\overgroup, \overrightarrow, \overleftrightarrow), #180 (\xrightarrow, \xrightleftharpoons), #292 (\widehat, \overbrace, \underbrace), #338 (\vec, \bar).

  This work has been made possible thanks to the financial support of a generous sponsor.

  It is now possible for a symbol with operands above or below, or for a decoration above or below an expression, to stretch (extend) so that its width will match the width of the operands or expression.

  These extensible symbols and decorations are important for some domains such as geometry and chemistry.

  This release introduces th following new commands:

  • \overrightarrow{base}
  • \overleftarrow{base}
  • \Overrightarrow{base}
  • \overleftharpoon{base}
  • \overrightharpoon{base}
  • \overleftrightarrow{base}
  • \overbrace{base}
  • \overlinesegment{base}
  • \overgroup{base}
  • \underrightarrow{base}
  • \underleftarrow{base}
  • \underleftrightarrow{base}
  • \underbrace{base}
  • \underlinesegment{base}
  • \undergroup{base}
  • \xrightarrow[below]{above}
  • \xleftarrow[below]{above}
  • \xRightarrow[below]{above}
  • \xLeftarrow[below]{above}
  • \xleftharpoonup[below]{above}
  • \xleftharpoondown[below]{above}
  • \xrightharpoonup[below]{above}
  • \xrightharpoondown[below]{above}
  • \xlongequal[below]{above}
  • \xtwoheadleftarrow[below]{above}
  • \xtwoheadrightarrow[below]{above}
  • \xleftrightarrow[below]{above}
  • \xLeftrightarrow[below]{above}
  • \xrightleftharpoons[below]{above}
  • \xleftrightharpoons[below]{above}
  • \xhookleftarrow[below]{above}
  • \xhookrightarrow[below]{above}
  • \xmapsto[below]{above}
  • \xtofrom[below]{above}
  • \xrightleftarrows[below]{above}
  • \xrightequilibrium[below]{above}
  • \xleftequilibrium[below]{above}

  In addition, the following commands can now be used to represent stretchy accents:

  • \widehat{base}
  • \widecheck{base}
  • \widetilde{base}
  • \utilde{base}

• Improved rendering and layout of \enclose

• Improved layout of overunder atoms

• Improved layout of accent atoms

• Improved fidelity of styling commands (\textup, \fontseries, etc…). They are now closer to what LaTeX does, in all its wonderful weirdness (see https://texfaq.org/FAQ-2letterfontcmd). Added \selectfont command.

Issues Resolved

• #371: When clicking after the last element in the mathfield, always set the anchor to be the last element in the root, i.e. as if moveToMathFieldEnd had been performed. For example, if the content is “x^2”, clicking after the end of the field will put the caret after the last element (not after the “2” in the superscript)

• #372: Using an argument in a macro will result in the argument to be substituted without a group being inserted. Previously, #1 with ax as a value for the first argument would have resulted in {ax}. This was noticeable when using the x^2 key in the virtual keyboard: if the equation was ab, pressing that key resulted in {ab}^2. It now results in ab^2

• Fixed an issue rendering some commands such as \boxed and others when in static mode. An over-agressive optimization would coalesce spans with no content, even though they may include important styling info.

• Fixed the rendering of infix commands with arguments, e.g. \atopwithdelims and overwithdelims. The arguments of infix commands were incorrectly merged with the suffix.

• Fixed inter-atom spacing of overunder atoms (they should space as mord)

Code Maintenance

• Re-factored the definitions of functions, symbols and environments which are now split in multiple files instead of being all contained in core/definitions.js

• Re-factored and isolated the metadata about LaTeX commands (frequency and category). This should reduce the amount of data carried by the core package. All the metadata is now in definitions-metadata.js. As a side effect, the examples displayed in the popover window might be less complete, but the removal of popover is on the roadmap.

• Removal of default export for some modules. Need to complete it for all the remaining modules.

0.34.0 2020-02-05

Issues Resolved

• Fix #364: Some expressions containing placeholders, when inserted, would not have the placeholder selected. For example, when using the “differentialD” key in the virtual keyboard.
• Fix #349:
  • ‘latex-expanded’ format no longer returns \mleft and \mright. This format is intended for inter-exchange with other TeX-compatible renderers and the \mleft and \mright commands are not widely deployed.
  • The content exported to the clipboard is now surrounded by $$ to more clearly indicate that the content is using TeX format.
  • When pasting content that begins/ends with $ or $$, assume LaTeX format
• Fix keyboard shortcuts, e.g. “alt+(” or “alt+v”
• Fix #354: The argument of \operatorname is of type ‘math’, not ‘text’. This means that using the ‘\text’ command inside the argument is valid and that spaces should be ignored by default (but the ~ character can be used to insert a space in that context).
• Fix #282: Some keys from the virtual keyboards (‘e’, ‘i’) produce an incorrect input.
• Fix #227: An operator (\sin) following some text is incorrectly considered to be part of the text.

Features / Improvements

• Documented suppressChangeNotifications options for $insert()
• Document config.smartMode (#312)
• The ‘surd’ (root) and ‘leftright’ (fences) elements now change color when the caret is inside their body. This helps distinguish the case where the caret position may be ambiguous, for example when it is either after the last element of the body of a ‘surd’ or the first element after the ‘surd’.
• #339: Read-only mode. Set the mode to read-only with mf.$setConfig({readOnly: true}). When this mode is activated, the formula can be selected (so it can be copied), but it cannot be modified by the user. Progammatic modification is still possible.

0.33 2019-12-19

Issues Resolved

• Fix #313. Text mode content is not output in MathML, speech and MathJSON (contribution by @NSoiffer)
• Fix #275: Selection improvements (use centerpoint to calculate nearest atom) and make delimiters selection eligible.

0.32.3 2019-10-29

Issues Resolved

• Fix #286 \mathbb{}s are missing in the LaTeX output

0.32.2 2019-09-24

Issues Resolved

• Fixed an issue where some keys in the virtual keyboard would be unresponsive

0.30.1 2019-07-30

Features / Improvements

• Added Typescript type definition

0.30 2019-07-18

Non-backward compatible changes

• #157: Public APIs that don’t start with $ have been removed. If your code used any of these APIs, add a $ in front of their name. See #157 for the complete list.

Features / Improvements

• #231: smartMode now supports Greek (the language). Also, Greek localization.
• Don’t display i-beam cursor over non-interactive content
• Use CSS class .ML__smart-fence__close to style closing smart fence
• Added speech support for text mode and units (contributed by @NSoiffer)

Issues Resolved

• Fixed an issue where clicking past the end of the equation would select the numerator or denominator if the last element was a fraction, instead of place the cursor after the fraction (regression)
• Removed dependency on open-cli
• #220 Fixed an issue where tabbing out of a mathfield would break command mode and some functions
• #209, #214, #211 et. al. Improvements to SSML support and karaoke mode contributed by @NSoiffer
• #217 Fixed an issue with parentheses in numerator of fractions
• #212: Fix round-tripping of \mathbb
• #194: When using the virtual keyboard, interpolate #@
• Fixed an issue where “(” was incorrectly gobbled as argument to a fraction
• Fixed an issue where smartFence off was ignored
• #202: use numeric character references instead of named entities in MathML output

0.29.1 2019-05-19

Issues Resolved

• #201: the popover button was not responsive
• #195: (partial fix) improve support for Edge (still requires Babelization)
• Fixed an issue while dragging to select across elements of different depths
• Fixed issue with smartMode for expressions including “x^2”, “xyz” and “\pi”
• Fixed an issue with styling, where the LaTeX output could sometimes include the non-existent \mathup command. The correct command is \upshape
• Fixed issues with enclose layout
• Avoid triggering spurious notifications while inserting an inline shortcut

0.29 2019-05-09

Major New Features

• Scrollable mathfield. The mathfield now behaves like a text area: the content that does not fit withing the bounds of the mathfield will not overflow but will be scrollable. The scrolling can be done using the mouse wheel or trackpad gestures, or by dragging while selecting. The AP

Improvements

• When smartFence is on, and a new smart fence is inserted (by typing ( for example), the closing ‘phantom’ fence would be displayed immediately after the opening fence. The closing fence will now be inserted after the end of the expression.
• The heuristics for determining implicit arguments, for example the implicit numerator when typing / have been improved. For example, typing / after 3 + 2sin x will result in 3 + (2sin x)/(...) instead of 3 + sin (x)/(...).
• When config.removeExtraneousParentheses is true (default), if a frac is inserted inside parentheses, the parens will be removed. So, if a / is typed after 1 in (1) it will become 1/(...).
• When smartMode is on, textual operators are eligible for conversion to text. Previously, if an inline shortcuts for rad was defined to \operatorname{rad} and ‘radius’ was typed, only ius would be turned to text.
• Smartmode is now applied when there is a selection. That is, if some text is selected and the / is pressed the selection will become the numerator. Previously the selection was deleted and replaced with an empty fraction
• Improved layout of surds, particularly when the surd is empty
• Made \mathbb{} et al. apply to the argument only, and not affect the style of following characters. Previously, if a \mathbb{R} was inserted, the following typed character would also be in Blackboard style.
• Improved build system on Windows. That is, it now works.
• Merge speak and readAloud APIs into one (contribution from Neil. Thanks Neil!)
• Switched to using npm ci for CI builds. Even for local builds, it is recommended to use npm ci to ensure the correct version of the dependencies are installed.
• In smartMode, the currency symbols are handled better. “One apple is $3.14” will result in the “$” being in math mode.
• Switching to/from command mode will not suppress smart mode.

Issues Resolved

• Fixed a crash when using smartFence with sin(x^2/
• Fixed alt+= keyboard shortcut on Windows.
• Fixed some layout issues with box and enclose
• Smart Fences will now work when invoked from the virtual keyboard.
• Fixed #177: custom localization strings are now handled correctly.
• Fixed some issues toggling style when selection is empty.

0.28 2019-04-22

This release contains some small Issues Resolved and improvements.

• Reduced Node version required (for dev builds) to Node LTS
• Fixed some issues with focus state of mathfields, particularly with multiple mathfields on a page
• Fixed an issue with some keys (such as /) on international keyboards (such as QWERTZ)
• Made moveToOpposite correctly select the opposite superscript/subscript
• Use the correct font for \operatorname, even for single character operators
• Send content change notifications when array cells are created
• Fixed a layout issue with upsized (\huge) content in fractions
• More accurate layout for box atoms (with \bbox, \colorbox, \boxed and \fcolorbox)
• Fixed an issue where units after an exponent were not recognized
• Fixed an issue displaying virtual keyboard on narrow Android phones

New Features

• Added support for applying size to the selection with applyStyle({size:'size9'}) (default size is size5, smallest is size1, largest is size10).
• Added support for npm run start which will start a local web server for ease of debugging (some features, such as using JavaScript native modules, require a local server)

0.27 2019-04-08

Breaking Changes

• The syntax that MathJSON/MASTON can recognized has been significantly expanded. It also has been made more consistent, and in some cases it may be different than what was previously returned.
• Future breaking change: the selector enterCommandMode will be deprecated and replaced by the more general switchMode('command'). The selector switchMode('command') is available in this release, and enterCommandMode is supported as well but it will be removed in a future release and you should migrate to switchMode() as soon as possible.

Major New Features

Text Mode (#153)

It was previously possible to enter text in an equation using the \text{} command and its family using the command mode. However, this feature was only suitable for advanced users, and had many limitations (text could not include spaces, for example).

MathLive now fully support a dedicated text mode.

To switch between math and text mode, use the alt/option+= keyboard shortcut, or programmatically using mf.$perform(['apply-style', {mode: 'math'}]). If there is a selection it will be converted to the specified mode (math is converted to ASCII Math). If there’s no selection, the next user input will be considered to be in the specified mode.

The current mode can also be changed using mf.$perform(['switch-mode', {mode: 'math'}]) without affecting the selection.

To indicate the current mode, a (slightly) different cursor is used (it’s thinner in text mode). The text zones are also displayed on a light gray background when the field is focused.

A notification is invoked when the mode changes: config.onModeChange(mf, mode) with mode either "text", "math" or "command".

Smart Mode

If config.smartMode = true, during text input the field will switch automatically between ‘math’ and ‘text’ mode depending on what is typed and the context of the formula. If necessary, what was previously typed will be ‘fixed’ to account for the new info.

For example, when typing “if x >0”:

• “i” → math mode, imaginary unit
• “if” → text mode, english word “if”
• “if x” → all in text mode, maybe the next word is xylophone?
• “if x >” → “if” stays in text mode, but now “x >” is in math mode
• “if x > 0” → “if” in text mode, “x > 0” in math mode

Smart Mode is off by default.

Manually switching mode (by typing alt/option+=) will temporarily turn off smart mode.

Examples

• slope = rise/run
• If x > 0, then f(x) = sin(x)
• x^2 + sin (x) when x > 0
• When x<0, x^{2n+1}<0
• Graph x^2 -x+3 =0 for 0<=x<=5
• Divide by x-3 and then add x^2-1 to both sides
• Given g(x) = 4x – 3, when does g(x)=0?
• Let D be the set
• \int_{the unit square} f(x,y) dx dy
• For all n in NN

Styling

It is now possible to apply styling: font family, bold, italic, color and background color. This information is rendered correctly across math and text mode, and preserved in the LaTeX output.

The key to control styling is the $applyStyle(style) method:

If there is a selection, the style is applied to the selection.

If the selection already has this style, it will be removed from it. If the selection has the style partially applied, i.e. only on some portions of the selection), it is removed from those sections, and applied to the entire selection.

If there is no selection, the style will apply to the next character typed.

• style an object with the following properties. All the properties are optional, but they can be combined.
• style.mode - Either "math", "text" or "command"
• style.color - The text/fill color, as a CSS RGB value or a string for some ‘well-known’ colors, e.g. ‘red’, ‘#f00’, etc…
• style.backgroundColor - The background color.
• style.fontFamily - The font family used to render text. This value can the name of a locally available font, or a CSS font stack, e.g. “Avenir”, “Georgia, Times, serif”, etc… This can also be one of the following TeX-specific values: - "cmr": Computer Modern Roman, serif - "cmss": Computer Modern Sans-serif, latin characters only - "cmtt": Typewriter, slab, latin characters only - "cal": Calligraphic style, uppercase latin letters and digits only - "frak": Fraktur, gothic, uppercase, lowercase and digits - "bb": Blackboard bold, uppercase only - "scr": Script style, uppercase only
• style.fontSeries - The font ‘series’, i.e. weight and stretch (“series” is TeX terminology). The following values can be combined, for example: “ebc”: extra-bold, condensed. These attributes may not have visible effect if the font family does not support this style: - "ul" ultra-light weight
  • "el": extra-light - "l": light - "sl": semi-light - "m": medium (default) - "sb": semi-bold - "b": bold - "eb": extra-bold - "ub": ultra-bold - "uc": ultra-condensed - "ec": extra-condensed - "c": condensed - "sc": semi-condensed - "n": normal (default) - "sx": semi-expanded - "x": expanded - "ex": extra-expanded - "ux": ultra-expanded
• style.fontShape - The font ‘shape’ (again, TeX terminology), i.e. italic or condensed.
  • "it": italic
  • "sl": slanted or oblique (often the same as italic)
  • "sc": small caps
  • "ol": outline

Contextual Inline Shortcuts

Previously, some shortcuts would get triggered too frequently, for example when typing “find”, the “\in” shortcut would get triggered.

Now, a shortcut can be defined with some pre-conditions. It is still possible to define a shortcut unconditionally, and thus if you are using custom inline shortcuts, they do not need to be updated:

config.inlineShortcuts = {
  in: '\\in',
};

However, a shortcut can now be specified with an object:

config.inlineShortcuts = {
  in: {
    mode: 'math',
    after: 'space+letter+digit+symbol+fence',
    value: '\\in',
  },
};

The value key is required an indicate the shortcut substitution.

The mode key, if present, indicate in which mode this shortcut should apply, either "math" or "text". If the key is not present the shortcut apply in both modes.

The "after" key, if present, indicate in what context the shortcut should apply. One or more values can be specified, separated by a ‘+’ sign. If any of the values match, the shortcut will be applicable. Possible values are:

• "space" A spacing command, such as \quad
• "nothing" The begining of a group
• "surd" A square root or n-th root
• "frac" A fraction
• "function" A function such as \sin or f
• "letter" A letter, such as x or n
• "digit" 0 through 9
• "binop" A binary operator, such as +
• "relop" A relational operator, such as =
• "punct" A punctuation mark, such as ,
• "array" An array, such as a matrix or cases statement
• "openfence" An opening fence, such as (
• "closefence" A closing fence such as }
• "text" Some plain text

Other Features

• Arrays, matrices and cases can now be edited. To create a a matrix, after a ( or a [, type some content then [RETURN]: a second row will be added to the matrix. Similarly, typing [RETURN] after a { will create a cases statements.
  • To insert a new row, type [RETURN]
  • To insert a new column, type alt/option+, (comma), the Excel shortcut for this operation.
• Support for \emph (emphasis) command, which can be used to (semantically) highlight an element. This command works both in text and math mode (it only works in text mode in TeX). For example:

\text{In the formula}\emph{x}+1=0\text{x is the \emph{unknown}}

• Support for \cssId and \class commands. These are non-standard TeX commands which are supported by MathJax.
  • \cssId{id}{content} Attaches an id attribute with value id to the output associated with content when it is included in the HTML page. This allows your CSS to style the element, or your javascript to locate it on the page.
  • \class{name}{content} Attaches the CSS class name to the output associated with content when it is included in the HTML page. This allows your CSS to style the element.
• config.removeExtraneousParentheses (true by default) extra parentheses, for example around a numerator or denominator are removed automatically. Particularly useful when pasting content.
• Improvements to clipboard handling, pasting and copying. Now supports pasting of ASCIIMath and UnicodeMath (from MS Word) and LaTeX.
• Support for output of ASCIIMath using mf.$text('ASCIIMath') and mf.$selectedText('ASCIIMath')
• config.smartSuperscript If true (default), when a digit is entered in an empty superscript, the cursor leaps automatically out of the superscript. This makes entry of common polynomials easier and faster.
• config.scriptDepth Controls how many levels of subscript/superscript can be entered. By restricting, this can help avoid unwanted entry of superscript and subscript. By default, there are no restrictions.
• #156: localization support, including French, Italian, Spanish, Polish and Russian.
• New visual appearance for selected elements.

Other Improvements

• When in command mode (after pressing the '' or ‘ESC’ key), pressing these keys will have the indicated effect:
  • [ESC]: discards entry and return to math mode
  • [TAB]: accept suggestion and enter it
  • [RETURN]: enter characters typed so far, ignoring any suggestion.
• #132: Support for smart fence with {}, and \langle.
• Pressing the spacebar next to a closing smartFence will close it. Useful for semi-open fences.
• Improved rendering performance by 8%
• Updated SRE support
• Improvements to undo/redo support. Fix #137, #139 and #140.
• Significant improvements to the Abstract Syntax Tree generation (MASTON/MathJSON), including #147
• Keyboard shortcuts that override inline shortcuts and Smart Fence: option/alt+|, option/alt+\. Also available are option/alt+( and option/alt+)

Issues Resolved

• #155: A cases statement (or a matrix) can now be deleted. The rows and columns inside a cases statement (or a matrix) can also be deleted.
• #133: Clicking on a placeholder selects it.
• Fixed issue with positioning of Popover panel.
• Correctly render \ulcorner, \urcorner, \llcorner and \rrcorner
• #141: Improved interaction of placeholders and smart fences
• #136: Close open smart fence with moveAfterParent only when at the closing of a smart fence
• #142: MathML output: supports sup/sub applied to a function
• Improved handling of shortcuts.
• #149: Fix handling of \prime and \doubleprime
• #111: Fix issue where a subscript followed a superscript and were not properly combined.
• #118. Improved navigating out of inferior limits
• Improve visual blinking when selecting with the mouse to the left

0.26 2019-02-04

Breaking Changes

• Public method now start with $. This convention is also used, for example, by the Vue.js project. For now, aliases exist that begin with ‘_’ (the previous convention), however you are encourage to migrate as soon as possible. The function that are affected are: _el(), _insert(), _keystroke(), _latex(), _perform(), _revertToOriginalContent(), _selectedText(), _selectionAtEnd(), _selectionAtStart(), _selectionDepth(), _selectionIsCollapsed(), _setConfig(), _text(), _typedText() (this was initially implemented in 0.25)

Major New Features

• Support for dark mode. Triggered automatically by the browser or by setting theme="dark" on the <body> tag.
• New implementation for inline shortcuts. Now support complex inline shortcuts including _, ( and other keys.
• Virtual Keyboards can now be described using a JSON data structure. Contribution from @rpdiss. Thanks!
• New MathLive.toSpeakableText() function
• New config.onAnnounce handler

Other Improvements

• The $perform() function now accepts selector both in camelCase or kebab-case.
• Improved display of some keys in the keyboard caption panel
• New logo!
• Improved documentation, including adding pages for keyboard shortcuts, examples, macros, selectors and config options.
• Better support for IE11 via transpiling (thanks @synergycodes!)

Issues Resolved

• #103 - Fixed issues where the math path could become invalid. Also made the code more resilient to invalid paths.
• #128 - Properly cleanup event handlers on destruction

Codebase Health and Performance

• Some minor optimizations and performance improvements, including lazy loading of sounds and some other resources.
• Moved some modules to classes.

0.25 2018-12-29

Major New Features

• A Vue.js wrapper and example is available in examples/vue

Issues Resolved

• #104 - Numeric keypard “/” was ignored.
• #91 - Handling of ‘~’ as an operator and a shortcut.

0.24 2018-12-16

Breaking Changes

• Several handlers had some inconsistent signatures, or in some cases passed invalid values as their arguments. This has been fixed, but it required changing the signature of some handlers. For consistency, the first argument of the handlers now refers to the mathfield to which it applies.

MathLive.makeMathField('input', {
  onContentDidChange: (mf) => {
    document.getElementById('output').innerHTML = mf.latex();
  },
});

Keep in mind that arrow functions lexically bind their context, so this actually refers to the originating context (not to the mathfield).

The affected handlers are:

• onFocus
• onBlur
• onKeystroke
• onMoveOutOf
• onTabOutOf
• onContentWillChange
• onContentDidChange
• onSelectionWillChange
• onSelectionDidChange
• onUndoStateWillChange
• onUndoStateDidChange
• onVirtualKeyboardToggle
• onReadAloudStatus

It is recommended that you check if you use any of those handlers and validate their signatures.

Major New Features

• Support for native JavaScript modules, contributed by Jason Boxman (https://github.com/jboxman). Thanks, Jason!

The previous method, using a <script> tag, is still supported:

<script src="../../dist/mathlive.js"></script>

but it is recommended to use native JavaScript modules:

<script type="module">
  import MathLive from '../../dist/mathlive.mjs';
</script>

(note the .mjs extension indicating this is a JavaScript module).

A few caveats about using modules:

• JavaScript modules are automatically in strict mode
• To use JavaScript modules you need to be in your own module. With a <script> tag, this is indicated by adding the type='module' attribute. The code inside a module is not leaked to the global scope, the module has its own scope. As a result, functions defined inside the module (inside your <script> tag) will not be visible outside the module. You will need to either attach them to a global object (such as window) or in the case of even handlers, attach them to the relevant element, using addEventListener.

See examples/basic/index.esm.html for a complete example.

If you were previously loading the non-minified version, that is the raw sources, which can be useful to debug issues, you need to use modules to load them, while you may have used requirejs previously. The sources are now included in the distribution for this purpose.

Instead of:

    define(['mathlive/src/mathlive'], function(MathLive) {
        MathLive.makeMathField(/*...*/);
    }

use:

import MathLive from '../../dist/src/mathlive.js';
MathLive.makeMathField(/*...*/);

• Support for SRE (Speech Rule Engine) from Volker Sorge. Optional, and needs to be installed separately.
• Improved text to speech support, including karaoke mode (read aloud with synchronized highlighting)
• New configuration setting to control the spacing between elements, horizontalSpacingScale. Supplying a value > 1.0 can improve readability for some users.
• Added notifications when undo state change, onUndoStateWillChange and onUndoStateDidChange
• Added support for correctly inserting rows and columns in arrays.

Other Improvements

• Fixes in MASTON
• Improved cross-browser accessibility support
• Fix MathML output for superscripts
• Fix issue #75 (autoconvert would fail in some cases)
• Fix issue #114. Incorrect selection when shift-select at the end.
• Fix issue #78. Cross-out positioning issue

0.22 2018-04-11

Major New Features

• Support for styling in the virtual keyboard UI: the text and highlight color can be adjusted to emphasize a portion of a formula
• Smart Fences. When a fence (“(”, “{”, etc…) is inserted, a matching closing fence is automatically inserted, displayed as a greyed out placeholder.
  The LaTeX code inserted will vary depending on the context where the insertion is made, either standalone characters (() or \left...\right. This feature is on by default and can be turned off with config.smartFence.
  Option-9 and Option-0, as well as \( and \) will override the setting and insert a plain old parenthesis.
• \mleft...\mright. Similar to \left...\right (i.e. grow in height depending on its content) but with vertical spacing before and after similar to \mathopen and \mathclose. Used automatically by smart fences after a function such as \sin or f.
• Haptic and audio feedback for the virtual keyboard.
  Haptic feedback is available on Android only.
  Two new config options to control it. config.keypressVibration, which is on by default, control the haptic feedback. config.keypressSound control the audio feedback (off by default). Specify the URL to a sound file to be played when a key on the virtual keyboard is pressed, or an object with a delete, return, spacebar and default (required) keys to specify different sounds for those keys.

Other New Features

• When a fraction is inserted, for example by pressing ‘/’, the items before the insertion point are considered as potential numerator. This now include parenthesized expressions and roots. In the case of parenthesized expressions, the parentheses are removed before being adoped for the numerator.
• MASTON: Use Unicode to represent math-variant letters (e.g. ℂ)
• Convert math-variant letters encoded in Unicode to LaTeX when pasting (e.g. ℂ becomes \C, 𝕰 becomes \mathord{\mathbf{\mathfrak{E}}}
• MASTON: Commutativity support. a + b + c → add(a, b, c)
• MASTON: Right and left-associativity support (‘=’ and ‘=>’ are right associative)
• Improvements to the delete behavior: when to the right of a \left...\right deletes remove the closing fence, not the whole expression. Same for root, fractions, and other groups. When at the beginning of a denominator, pressing delete will remove the fraction, but keep numerator and denominator, etc…
• When using the command virtual keyboard, switch to command mode as necessary.
• Added MathAtom.skipBoundary. When true, navigating into/out of the atom the last/first element will be skipped. For example, with \textcolor{} this implements a behavior similar to word processors.

Issues Resolved

• Fixed #63: improved displayed of \enclose over stacked atoms such as fractions and \overset
• Fixed issue with selecting sparse arrays
• Make \bigl et al. properly selectable

Code Maintenance and Performance

• Moved operator precedence and canonical names from Definitions to MASTON.
• Improved rendering performance by eliminating hotspots through profiling.

0.21 2018-03-30

Major New Features

• Basic support for LaTeX macros. Macros can be defined with MathField.$setConfig({macros:'...')
• Display alternate keys when a key on the virtual keyboard is held down.
• Support for AZERTY, QWERTZ, Dvorak and Colemak virtual keyboards. Can be setup with MathField.$setConfig({virtualKeyboardLayout:'...'). Also, shift clicking on the keyboard icon toggles between layouts.

Other New Features

• Toggle the virtual keyboard layer when the shift key is pressed
• New onVirtualKeyboardToggle handler will get called when the visibility of the virtual keyboard changes. Useful to scroll into view important content that might be obscured by the keyboard.
• Some common functions added as inline shortcuts: limsup, liminf, argmin, argmax, bessel, mean, median, fft.
• Added \rd command (synonym with \differentialD and used by Proof Wiki)
• Added a format option (latex-expanded) to MathField.text() and MathField.selectedText() to return LaTeX with macros expanded.
• Removed restrictions on charset in text
• Support shift + arrows to extend the selection with the virtual keyboard

Issues Resolved

• More accurate operator precedence. Follow the MathML recommendation, except for arrows that are given a way too high priority in MathML.
• Correctly output to LaTeX the \unicode command
• When undoing, correctly restore the selection
• Improved behavior when inserting superscript and subscript on a selected item
• Fixed handling of unbalanced \left…\right sequences
• Correctly output the minus sign to LaTeX (as U+002D not as U+2212)
• Fixed some cases where the layout would shift by a couple of pixels as you navigated into the expression

Code Maintenance and Performance

• Use .test() instead of .match() whenever possible
• Eliminated .value and .children in Math Atoms. It’s only .body now.
• Avoid unnecessary rendering while tracking the pointer
• Refactored the Popover code into Popover.js
• Moved some content from Definitions.js and into Popover.js

0.20 2018-03-24

Major New Features

• Virtual keyboards with multi-touch support
• BREAKING CHANGE: the command bar is no longer supported. Use virtual keyboards instead.

Other New Features

• Added support for wide layouts to virtual keyboard. If space is available, up to four more columns of keys can be displayed.
• Added Copy button to virtual keyboard
• Allow ‘space’ in command mode
• MASTON: improved parsing of numbers
• Handle Unicode pseudo-superscript characters as exponents

0.19 2018-03-19

Major New Features

• MASTON: first implementation
• Support selecting cells in arrays

Other New Features

• MASTON: handle complex numbers and modulo
• Added option for styling of keyboard glyph
• Improved output to LaTeX for arrays
• Additional trig and long functions (\lb, \arsinh, \arcosh, \artanh, \arcsech, \arccsh, \arcsec, \arccsc)
• MathML: more robust handling of complex <mo>
• MathML: improved handling of fences
• Improved LaTeX output

Issues Resolved

• Correctly handle latex output for the \char command
• Correctly handle invalid Unicode code points in the \char command
• Correctly output MathML for extended Unicode characters and \char command
• Correctly handle selection in sparse arrays
• Correct spacing issue of selected items
• Fixed #17: correctly extend the selection when the anchor is at the end of the selection
• The caret would not blink in empty supsub
• The last character of the selection would not be copied on the clipboard
• MathML: don’t insert &invisibleTimes; for factorial, but do insert it before a fence.
• Going up from a numerator longer than the denominator could hang.
• MathML and LaTeX output: better handling of \Big (etc…) delimiters
• MathML: do not render \text as <mi>
• LaTeX output: handle the \math... (\mathop, \mathbin…) family of functions
• Properly parse custom operators
• Commands with multiple keyboard shortcuts would not display correctly in the Popover panel

Code Maintenance and Performance

• Reduce the amount of markup generated, avoid generating markup for empty spans.
• Updated fonts from KaTeX

0.18 2018-03-04

Issues Resolved

• Fixed issue where \underset annotation was not selectable

Code Maintenance and Performance

• Reverted back to WebPack 3
• Simplified CSS and streamlined markup for vlist spans.

0.0.17 2018-02-27

New Features

• Improved accessibility support (major contribution from Neil Soiffer)
• Support for MathML output and LaTeX to MathML conversion.

Issues Resolved

• #26 Fixed issue with Chrome 62 where fraction lines and other thin lines would intermittently not render.
• #20, #51. Ensure that a placeholder is always present for numerator, denominator.
• #21. Do not allow sub-elements of an enclose element to be selected.
• Font-size will now respect font-size specified by the parent element. As a result of this non-backward compatible change, the size of the equation may now be different than it was. To ensure that the size remains the same as before, specify a font-size property on the parent element with a value of 16px.
• #29. Correctly handle $ and @ as inlineShortcuts
• Improved handling of undo.
• New implementation of \enclose notations.

0.0.16 2017-09-13

Deprecated Features

• MathField.write() has been deprecated. Use MathField.insert() instead.

New Features

• Added MathField.selectedText() which returns the textual content of the selection.

Issues Resolved

• Perform a snapshot with the undo manager when invoking MathField.insert().
• Documentation improvements.

0.0.15 2017-07-01

New Features

• Properly exported public API, including renderMathInDocument() and renderMathInElement()
• Added \enclose command, implementing the MathML equivalent.
• Added \cancel, \bcancel and \xcancel commands
• Added preserveOriginalContent option to MathLive.renderMathIn...()
• Made \backslash work in text mode, for example when an argument of \rlap{}
• Added revertToOriginalContent() when a math field is no longer needed for an element
• Added customization of the command bar. See MathField.$setConfig() and config.commands
• Added revertToOriginalContent() and getOriginalContent()
• Added optional namespacing of data- attributes
• Added onContentWillChange and onContentDidChange handlers in the math field config object.
• Added tutorials and improved documentation

Issues Resolved

• Fixed #5: AZERTY keyboard input was misbehaving, particularly for the ^ key
• Dead keys (´, ^, ¨, ˜ and others on some keyboards) were not properly handled
• Complex emojis (emojis made of multiple codepoints, such as emojis with skin tone modifiers, or emojis with a ZERO WIDTH JOINER, such as the David Bowie emoji) would be incorrectly recognized as multiple symbols
• Fixed the \color command
• Properly roundtrip to LaTeX \rlap, \color and many other commands. Now, copying content using these commands in a math field will result in the correct LaTeX code to be generated.