MathJax v4.1.2 released

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Davide Cervone

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May 4, 2026, 2:57:08 AM (4 days ago) May 4

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The MathJax team is pleased to announce the release of v4.1.2 of MathJax. This is mainly a bug fix release that resolves a number of issues from v4.1.1.

See the release notes for v4.1.2 for complete details.

The one change that may affect current content is that some of the font-sizing macros like \large and \tiny were setting the wrong sizes, and have been corrected. In particular, the sizes for \tiny and \Tiny were reversed, while the size for \large and the other larger sizes were all off by one size (\large was using the size that should have been for \Large, \Large was using the size of \LARGE, etc.), and \small was too small. These have all been fixed to use the correct sizes. Existing content that use these macros will now use the correct sizing values, and that may affect the results of those expressions. For this reason, we have added a new fontsizev3 TeX package that puts back the incorrect sizing values used in v3 and earlier versions of v4. If you include

window.MathJax = {
  loader: {load: ['[tex]/fontsizev3']},
  tex: {packages: {'[+]': ['fontsizev3']}},
};

in your configuration, you will keep the original sizes. In addition to these size corrections, the missing \SMALL, \Small, and \footnotesize were added, as was a non-standard \HUGE to correspond with the size available (incorrectly) as \Huge in the past.

Those who are using MathJax from a CDN like https://cdn.jsdelivr.net/npm/mathjax@4 should receive the new version automatically, though it may take some time to propagate through the CDN network. You may also have a cached version in your browser, so may need to either clear the browser cache, or relaunch your browser (or both) in order to get the latest version (the cached version should expire in about a week, depending on the CDN being used).