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v4.2

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•Last updated Oct 24, 2026

Changes for the v4.2 update

93% complete

Add support for delimiters that are specific to a mathvariant and use it for mhchem arrows. (mathjax/MathJax#3486)
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#1424 opened Jan 26, 2026 · Updated Oct 28, 2026
7
Update node-main to work in (webpacked) browser as well as node, and rename node-main to main
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#1566 opened Sep 11, 2026 · Updated Oct 12, 2026
20
Add support for dir=rtl in MathML and TeX, with automatic detection of rtl languages. (mathjax/MathJax#3594)
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#1572 opened Sep 20, 2026 · Updated Oct 20, 2026
13
Fix problems with handling of font-size CSS, mathsize, and fontsize attributes.
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#1578 opened Oct 11, 2026 · Updated Oct 21, 2026
11
Better handling of errors when starting up the speech worker. (mathjax/MathJax#3620)
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#1583 opened Oct 24, 2026 · Updated Oct 24, 2026
1