Document difference to sphinx-hoverxref

[twodrops]

There seems to be another popular preview extension for Sphinx.
https://sphinx-hoverxref.readthedocs.io/en/latest/

It is used in MySt examples.
https://myst-parser.readthedocs.io/en/latest/syntax/syntax.html

If a co-existence, make sense, it would be nice to document the differences in Readme.

[danwos]

I haven't used it, but I thought it could only be used when the docs are deployed on readthedocs.
But maybe this has changed.

It also shows the first paragraph only and does not allow to navigate inside the shown text.

On the other side, the preview-window works better for chrome in sphinx-hoverxref.

[jdillard]

I haven't used it, but I thought it could only be used when the docs are deployed on readthedocs.
But maybe this has changed.

Pretty sure that is still true.

There is also the recent https://github.com/chrisjsewell/sphinx-tippy which isn't dependent on being hosted on RTD.