Ihor Radchenko <yantar92@posteo.net> writes:

> I note that you did not mention in the news that MathJax 2 support is
> dropped. This is a very important thing we must highlight and ring all
> the bells about.

Fixed.  See the 8th revision of the patch attached below.  Better?

> Consider that someone has customized path option to a local copy of
> MathJax version 2. Then, things will get broken after the update!

Correct, and we spell it out in the manual, in the "... and breaking
changes" section.

Digression [no comment needed; just venting]: This confirms, again, that
we should focus on LaTeX, the strength of Org, instead of defaulting to
the unstable world of JavaScript, copying popular Markdown editors that
have to use MathJax do due to their lack of integration with LaTeX.

> However, it could be at least a good idea to warn the users who are
> trying to use MathJax 2.  Would it be possible?

As far as I know, we have no reliable way of knowing the version of
MathJax without actually reading the JavaScript file, locally and
remotely.

Rudy