Adapt the jQuery UI tooltip hack used for the overlib replacement with
tex4ht to upstream tex4ht.
Here's a cute idea: it would be great if copyleft.guide/LABEL from the
LaTeX sources always went to that place on the HTML version on
copyleft.org/guide/ I set a few of these up by hand already, but perhaps
there's a way that tex4ht could dump an list of URL redirects automatically
when it builds the HTML.
https://hypothes.is/ might be useful for quickly allowing web readers
to add changes.
