[romwell]

>There are popups for symbols inside large, dense equations. That can really help.

That can also really mess with screen readers and other accessibility features.

There's a reason PDF/A spec forbids scripts in any PDF documents that are expected to be available in the future.

[1] https://en.wikipedia.org/wiki/PDF/A

[lallysingh]

This is a good point. Can a similar markup mechanism help make accessibility easier? Equations are compact to the eye but can be really unpleasant read out loud.