Peter Krautzberger wrote:
I would like to propose a way for any visitor to opt-in
to MathJax on the
fly.
Hi.
It wasn't clear from your e-mail whether you realize that on Wikimedia
wikis (including Wikipedia), MathJax is already an opt-in option, albeit
only for logged-in users, not for all visitors. If you visit
Special:Preferences --> Math,[1] you can see the MathJax option toward the
bottom of the screen.
This is controlled by the "Math" MediaWiki extension.[2]
MZMcBride
[1]
https://en.wikipedia.org/wiki/Special:Preferences#mw-prefsection-rendering
[2]
https://www.mediawiki.org/wiki/Extension:Math