Add support for MathJax in CHTML and SVG mode

[ccameron-chromium]

No description provided.

[SteveLLamb]

@ccameron-chromium, this was to resolve this issue, correct? #333

These are the changes in whole you included here for 2094-50? https://github.com/ccameron-chromium/html-pub/tree/348386f1a92a67e0e8f670e5fd10a02a269fc69a

@palemieux for visibility.

[ccameron-chromium]

@ccameron-chromium, this was to resolve this issue, correct? #333

Yes, this is the full change that should resolve issue #333.

These are the changes in whole you included here for 2094-50? https://github.com/ccameron-chromium/html-pub/tree/348386f1a92a67e0e8f670e5fd10a02a269fc69a

Yes, that's the full change.

This formulation allows for MathJax and SMPTE validation to be robust to "racing" against each other. It may be that there's a better solution, but this was what I was able to figure out.