MathJax v2.6-beta.2

This is the third beta release for MathJax v2.6

The v2.6 release focuses on completing the CommonHTML output and improving accessibility.

For more information see

• the release milestone for more information.
• http://docs.mathjax.org/en/v2.6-latest/whats-new-2.6.html
• https://github.com/mathjax/MathJax/releases/tag/2.6.0-beta.0