MathJax equation previews

[albertfgu]

Have you checked that your feature request isn't already filed?

• I read through FAQ and searched through the past issues, none of which addressed my feature request.
• Yes, I have checked that this feature request isn't already filed.

Description & Motivation

I saw elsewhere that it's possible to configure so that hovering over an equation reference can display a preview of the actual equation (much like hovering over footnotes or references shows the linked object in place).

Discussion:
https://gist.github.com/mauriciopoppe/ec311235997fab7b2993

Would it be possible to support this feature?

Pitch

This is a non-critical but nice-to-have feature that could make reading technical blog posts easier without having to jump back and forth for references.

Alternatives

No response

Additional context

No response

[george-gca]

It is worth taking a look.