MathJax v2.6 beta now available

Today we are entering the public beta phase of MathJax v2.6. This release focused on two main features:

  1. Completing the CommonHTML output, a faster HTML output that can be generated on both client and server.

  2. Accessibility improvements in the form of

    • an extension to expose MathJax’s internal MathML to screenreaders
    • making the MathJax Menu accessible.

The v2.6 release also includes over 30 bug fixes to increase the quality and stability of MathJax (see below for details).

The beta is available via our CDN at which you can load it in place of the version you are currently using. Alternatively, you can get a ZIP archive or access the branch on GitHub.

Please note the following.

Changes to the default MathJax “TeX” fonts

We have updated our default MathJax “TeX” fonts to improve the CommonHTML output and simplify its layout process. If you have previously installed a copy of the MathJax TeX fonts to your local system, please update that copy to ensure correct rendering in the CommonHTML output.

You can check this using the embedded page below (external link) which will detect whether you need to update installed MathJax “TeX” fonts installed.

See the Pen MathJax Font Check by MathJax (@mathjax) on CodePen.

Note: Other applications may have installed the MathJax “TeX” fonts for you.

Note: The changes to the MathJax “TeX” fonts are backward compatible to previous versions of MathJax so you can install them without worrying about sites using older MathJax versions. Of course you do not need to install the fonts as MathJax can automatically load webfonts instead.

Changes to the combined configuration files

If you are using a combined configuration, please note the following:

  1. We have added several new combined configuration files. In particular, you can use the new CommonHTML output by chosing a combined configuration ending on _CHTML.

  2. The new AssitiveMML.js extension is included in these configurations. If you want to de-activate it, add, e.g., the following to your page before MathJax.js is loaded.

Remember that this is still beta software, so if you are not an experienced user, you may want to wait for the official 2.6 release. We do not recommend that you use the 2.6-beta version for production environments, but do encourage you to test your content with it.

If you are linking to, note that at the point of the official release of v2.6, the address will begin to serve MathJax v2.6. You can also continue to use v2.5 by linking to instead — and you can change to that version at any point (it is available now). Once the official v2.6 release is made, the v2.6-beta address will be removed from the CDN.

The official release of v2.6 should occur within the next three weeks, but we want you to be able to start to test out the v2.6 features now. Please report any bugs you find to the issue tracker at

Thanks for your continuing interest in MathJax. We hope that this release makes your MathJax experience even better.

The MathJax Team.

New in MathJax v2.6

MathJax v2.6 includes a number of new features, as well a more than 30 important bug fixes. The following are some of the highlights.


  • Improved CommonHTML output. The CommonHTML output now provides the same layout quality and MathML support as the HTML-CSS and SVG output. It is on average 40% faster than the other outputs and the markup it produces are identical on all browsers and thus can also be pre-generated on the server via MathJax-node. The fast preview mechanism introduced in v2.5 continues to develop as a separate output as PreviewHTML and the fast-preview extension.
  • Accessibility improvements. We thank the AT community for their guidance, support, and feedback in our efforts towards making MathJax completely accessible to all users.
    • Screenreader compatibility. The new AssistiveMML extension enables compatibility with most MathML-capable screenreaders by inserting visually-hidden MathML alongside MathJax’s visual output. See screenreader support for details on the expected behavior as well as background on the limitations due to lack of web standards and browser/OS technology.
    • Accesssible UI. We have improved the accessibility of the MathJax menu to enable assistive technology users to easily access its features, cf. MathJax UI.
  • Semi-slim MathJax repository for bower. You can now use bower install components/MathJax for a fork of MathJax without PNG fonts. Many thanks to @minrk from the IPython/Jupyter team and to the team at components!
  • Deprecated: MMLorHTML extension. We have deprecated the MMLorHTML extension. For a detailed guide on configuring MathJax to choose different outputs on different browsers, please see Automatic Selection of the Output Processor for more information.

Numerous bugs and issues have also been resolved; for a detailed listing please check the release milestone.


HTML/SVG/nativeMML display

  • #1095 HTML-CSS output: prevent collapse of table borders.
  • #596 SVG Output: Fix overlapping equation labels in SVG output
  • #994 SVG Output: Change default blacker setting to 1.
  • #995 SVG output: fix baseline alignment issues.
  • #995 SVG output: fix failure to scale all but the first glyph in a fraction when useFontCache=false.
  • #1233 SVG output: make maligngroup and malignmark produce no output.
  • #1035 PreviewHTML output: fix fractions formatting in WebKit and IE.

TeX emulation

  • #567 Add macro for overparen and underparen to provide stretchy arcs above/below
  • #956 Simplify the mhchem extension to use multiscripts, cf. #1072.
  • #1028 Fix spacing in \alignedat.
  • #1194 Fix problem where automatic numbering affects \binom and friends.
  • #1199 Fix problem with dot delimiter not being recognized as a delimiter.
  • #1224 Handle braces properly in text mode when looking for matching math delimiters.
  • #1225 Fix \operatorname not ignoring \limits that follow immediately after.
  • #1229 Fix wrong spacing of trailing binary operators.


  • asciimath/#31 Add support for overparen, underparen to produce mover and munder constructs.


  • #1072 Right-justify prescripts in mmultiscript elements (after clarification in MathML 3 editors’ draft); cf. #956.
  • #1089 Fix toMathML from changing <maligngroup> to <malign>
  • #1188 Fix mmultiscripts with odd number of post-scripts not rendering correctly.
  • #1231 Fix <math> element not being treated as an <mrow> for embellished operator spacing.
  • #1233 Make <maligngroup> and <malignmark> be self-closing in MathML input.
  • #1238 Fix Content MathML extension not handling namespace prefixes.
  • #1257 Improve mml3.js: better RTL support in HTML-CSS; improved IE/Edge compatibility.


  • #928 Add data for stretchy U+2322 (FROWN), U+2323 (SMILE), and also U+2312 (ARC) to be aliases for the top and bottom parentheses. This enables stretchy constructions; cf. also #567.
  • #1211 Fix web font detection for Gyre-Pagella etc. in IE10+.
  • #1251 Fix primes in STIX-web font being too small in SVG output.


  • #1248 Updated locales thanks to the contributors at; activate locales for Bulgarian, Sicilian, and Lithuanian.


  • #1216 Add debugging tips to console output.


  • #1074 Fix regression in v2.5 regarding MathPlayer on IE9.
  • #1036 Improve CDN rollover behavior.
  • #1085 Fix detection of Windows Phone mobile IE.
  • #1155 Work around websites using user agent filtering
  • #1173 Avoid warning message in debug mode.
  • #1208 Fix CHTML preview from setting chunking parameters even when disabled.
  • #1214 semi-slim official MathJax repository for bower; use bower install components/MathJax for a copy without PNG fonts. Special thanks to @minrk from the IPython/Jupyter team and to the team at components!
  • #1254 Improve examples in /test: add viewport meta tags, improve dynamic examples.