Draft for what's new page

This page (in ReST) is used for drafting the What's New page of each beta release.

It should be cleaned up as soon as the documentation update process (https://github.com/mathjax/MathJax/wiki/Documentation-update-process) completes.

What's New in MathJax v2.6

MathJax v2.6 includes a number of new features, as well a more than 30 important bug fixes. The following are some of the highlights.

New output. The new CommonHTML output now provide the same layout quality and MathML support as the HTML-CSS and SVG output. It is on average 40% faster than the other outputs and is identical on all browsers and thus can also be pre-generated on the server via MathJax-node. The fast preview mechanism introduced in v2.5 will remain as a separate component.
Accessibility improvements. We thank the AT community for their guidance, support, and feedback in our efforts towards making MathJax completely accessible to all users.
- Screenreader compatibility. The new AssistiveMML extension enables compatibility with most MathML-capable screenreaders by inserting visually-hidden MathML alongside MathJax's visual output. See `some link`_ for details on the expected behavior as well as background on the limitations due to lack of web standards and browser/OS technology.
- Accesssible UI. We have improved the accessibility of the MathJax menu to enable assistive technology users to easily use access its features.
Deprecated Feature: MMLorHTML extension. We have deprecated the MMLorHTML extension. For a detailed guide on configuring MathJax to choose different outputs on different browsers, please see `some page `_

Numerous display bugs, line-breaking problems, and interface issues have been resolved; for a detailed listing please check the release milestone.

#1095 HTML-CSS output: prevent collapse of table borders.
#596 SVG Output: Fix overlapping equation labels in SVG output
#994 SVG Output: Change default blacker setting to 1.
#995 SVG output: fix baseline alignment issues.
#995 SVG output: fix failure to scale all but the first glyph in a fraction when useFontCache=false.

#567 Add macro for overparen and underparen to provide stretchy arcs above/below
#956 Simplify the mhchem extension to use multiscripts, cf. #1072.
#1194 Fix problem where automatic numbering affects \binom and friends.
#1199 Fix problem with dot delimiter not being recognized as a delimiter.

#1072 Right-justify prescripts in mmultiscript elements (after clarification in MathML 3 editors' draft); cf. #956.
#1089 Fix toMathML changing <malignedgroup> to <malign>
#1188 Fix mmultiscripts with odd number of post-scripts not rendering correctly.

#928 Add data for stretchy U+2322 (FROWN), U+2323 (SMILE), and also U+2312 (ARC) to be aliases for the top and bottom parentheses. This enables stretchy constructions; cf. also #567.
#1211 Fix web font detection for Gyre-Pagella etc. in IE10+.

#1248 Updated locales thanks to the contributors at Translatewiki.net; activate locales for Bulgarian, Sicilian, and Lithuanian.

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