Invisible font in SVG Rendering

Created by: Herst

Odd issue, reproduced on latest Firefox on Windows (/edit: and Linux) with MathJax 2.3 and 2.4 on one website (but not e.g. the MathJax Play Area) using my bookmarklet:

Steps to reproduce: 1.) Go to http://www.informatik-forum.at/showthread.php?t=107276 (inofficial forum of my university, thread where I present my bookmarklet that brings MathJax power to there for those interested) 2.) In the first box after "Code:" you will see a bookmarklet, press F12 to go into the JS console and execute it there (interestingly no need to remove the "javascript:" prefix) (alternatively save it as a bookmarklet and then run it or use the unminimized code from the second box). 3.) The MimeTex-generated images will be replaced by MathJax-generated content. Change the rendering mode to SVG. 4.) Then it looks the following (at least for me): (for CDN version now, for beta replace the domains in the bookmarklet code)

Like I said reproduced on latest Firefox on Windows 8.1 (and latest Ubuntu). Fine on latest Google Chrome and and IE11 on Win8.1 (although in former I get a probably unrelated bug with the zoom window albeit also just in SVG mode: [should I fill extra bug report?])

PS: Notice also the lonely Eszett ("ß") that plays a role in bug #826 (closed) but the bug doesn't show here because STIX has that character (I guess).

PPS: Feedback on my bookmarklet is always appreciated.