When I read Andrey Vihrov's comment on the question XeLaTeX and Microtype, I noticed that the tooltips of the links to other questions produced by the
title HTML attribute are all the same, even though they refer to different questions. There seems to be a bug in the handling of automatically cropped tex.sx links.
(The title of the question that I was pointing at [underlined] actually is How to get hanging hyphenation?)
The corresponding source code confirms this behavior; strangely, for every question the
title attributes and values of the preceding
<a> tags are added and it seems browsers just take the first attribute and ignore the others.
(Behavior confirmed for FF5.0, Safari 5.0.5, IE 9.0.8112.16421, all on Win7 64bit. Still, no matter what browsers do, the redundant and wrong attributes should be eliminated.)