mathjax/mathjax-v3: MathJax v3 beta 3

This is the second public beta release of MathJax v3.

This is a beta release. Do not use this in production but please test it and report issues at https://github.com/mathjax/mathjax-v3/issues!

The master branch is not the beta release; it is the current development copy, set up for development testing. The beta branch is the beta release.

This release fixes a number of display issues with the SVG output (see #153, #156, #157, #137) and improves the output for nested tables, particularly those with labels and those with percentage widths, in both CommonHTML and SVG output. Problems with table lines in SVG output in Safari and IE were fixed as well.

The TeX input has been updated to include nearly all the extensions that were available in v2, including the color, action, unicode, bbox, html, and several other extensions. These are all included in the webpacked files available in the demos repository (listed below), although the color extension is not enabled by default in order to preserve the behavior of \color in version 2 (this will probably change in the official release of v3).

In addition, there were some changes internally to how the MathDocument and MathItem classes, and the Handler class now allows more flexibility in overriding these. These changes are needed to better support extensions that may need to subclass the document and math-item classes. The next release will formalize the extension mechanisms and will include examples of how extensions will operate.

Finally, the TeX-lab.html and MML-lab.html files have been merged into a single v3-lab.html, and the original files removed. This late allows you to experiment will both input and both output formats, as well as enable/disable each of the extensions individual.

This beta version includes two input processors (TeX and MathML) and two output processors (CommonHTML and SVG). Other input and output processors (e.g., AsciiMath input) will be added in the future.

The current TeX input processor has all the core functionality of the MathJax v2 TeX input, and several of the extensions built in, but some extensions are still to come. For example, \unicode, \bbox, and the color extension are not yet available.

The CommonHTML and SVG output implement all the MathML elements that they do in v2, but do not yet include support for line breaking (neither automatic nor explicit ones); this will be implemented in a later beta version. Both output renderers currently only support the MathJax TeX font; other fonts will be added in the future.

The CommonHTML output currently uses a very large CSS file that encodes the font information needed for all the characters in the MathJax TeX fonts. This is a preliminary implementation of the font support, which will be updated to reduce the size of the CSS in future versions.

The SVG output currently uses explicit SVG <path> elements for the characters it displays, whereas version 2 cached the paths in a common SVG <defs> element so that paths didn't have to be repeated in the individual expressions that used them. This will be implemented in a future version.

The MathJax contextual menu is not yet implemented.

The ability to configure MathJax through a configuration object, as in v2, is limited at the moment. In version 3, this type of customization is handled through building custom packed versions of MathJax, and that is not yet fully documented.

The https://github.com/mathjax/mj3-demos repository includes examples and webpacked files for the beta release. See the instructions there for how to use them.

The https://github.com/mathjax/mj3-demos-node repository includes examples for how to use MathJax version 3 with NodeJS.