<wbr> tags

Created by: mark-wade

I am a developer for a forum software which, to prevent long user-provideds topic titles with no spaces from breaking the layout, inserts wbr tags every 20 characters in words in titles that are longer than that. For example, if a user creates a title "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", it will get rendered as "aaaaaaaaaaaaaaaaaaaa-wbr-aaaaaaaaaaaaaaaaaaaa" (am using "-wbr-" rather than the actual tag as GitHub seems to parse it)

A bug report was submitted to us that this causes MathJax to not work correctly: http://community.invisionpower.com/4bugtrack/wbrwbr-randomly-added-to-topic-titles-after-upgrading-r3931/

The HTML5 tag represents a word-break oppertunity within text. Since MathJax modifies the content, it would be appropriate for it to ignore such tags within the content it intends to replace.