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This is the long-awaited 4.0.0 release of MathJax, which has been several years in the making. Among the many new features in this release are:
For many sites, the only change that will be needed to use v4 is to change the URL where you load MathJax to refer to version 4 rather than version 3, and to remove the /es5 directory from the URL. Most v3 configurations should still work with v4; but if you use the startup.ready() function to modify MathJax or create new TeX extensions, there may be some adjustments needed. One important change of note is that, since the number of TeX packages has grown, the all-packages extension and the "-full" components have been removed, so if you are using those, you will need to change to a component without the "-full" and either rely on the autoload extension to load the needed packages, or load them explicitly.
The MathJax documentation has been substantially updated for version 4, and now includes the missing or limited sections on using MathJax in node, including many examples and details. See the What's New in V4.0 section (more than 50 pages long) for much more information about the features described above, and in particular, check the Breaking Changes section for any changes that may affect your usage.
