Comment 4 for bug 502882

I don't know what you mean by "in general". Bug links in bug descriptions (such as in this very bug report!), bug comments, duplicate lists, and statically-generated duplicate markings all have tooltips. Dynamically-generated duplicate markings are, as far as I can tell, the odd one out.

Judging by the source code, the on-demand title= generation that Curtis and Deryck were discussing has been implemented. That should make this bug much easier to fix. Instead of the duplicate-marking script having to reimplement fmt:link client-side, all it should need to do is add class="bug-link" to the link when creating it. The existing bug-link-handling script will then take care of generating the tooltip. Right?