Currently it's not discoverable that positioning mouse over on an element is worth a try. I'm not quite sure what the best way to show it is. I'm going to propose a patch that adds an outline shadow on hover. Not that it's super self explanatory, but probably better that nothing. Thoughts?
Created attachment 220094 [details] proposed patch
Created attachment 220212 [details] poposed patch Updated to work with popovers on bubbles.
Comment on attachment 220212 [details] poposed patch This is fine. Maybe a dotted/dashed bottom border in the link color would be better?
> This is fine. Maybe a dotted/dashed bottom border in the link color would be better? I'm not sure if that would look right on bubbles, or on elements that are also links.
Comment on attachment 220212 [details] poposed patch Clearing flags on attachment: 220212 Committed r161261: <http://trac.webkit.org/changeset/161261>
All reviewed patches have been landed. Closing bug.