I find that when I move my mouse over a link to a post within the SE network, a "reveal" of the link will show in the bottom left corner of Chrome. Sometimes it shows the actual Question / Title, and sometimes it is just numbers. Why is that?
Further, sometimes the mouseover will show the title of the question in a tooltip, but sometimes not. What is up with that?
As an example, look at the links in the 2nd and 3rd comments in this UX question. You can simply mouse over this link - in my browser the full title shows in the lower left corner, but no tooltip, so it splits the difference of the two cases in the actual linked page (and is faster to try out).