This is the first alpha release of a major update to MathJax that adds significant new functionality, including:
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Support for 11 different fonts, including the STIX2 font set, five Gyre math fonts, and a sans-serif font based on the Fira-Math font.
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Support for automatic and explicit line breaks in both display and in-line expressions, automatic breaking of text elements, better breaking in tables and arrays, more array column specifiers for the array preamble, and TeX macros to control line breaking, indentation, and alignment, as well as more commands for making fixed-size boxes in which line breaking can occur.
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Support for HTML embedded in MathML and TeX expressions (e.g., you can insert form elements into the math).
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Improvements to the assistive support by including the expression explorer (activated) in all combined components.
See the release notes for extensive details about the new features and how to use them. This includes information about new configuration options for these features, and new TeX macros and control that they provide.