# Hover (question preview) box doesn't support TeX

On my setup it appears as though the limited preview rectangle, which shows as a pop-up when the mouse hovers above a question and contains a text excerpt of the question's main text, doesn't support TeX. Is it supposed to work like that or is this a bug?

Yes, it's supposed to work like that. The hover effect is achieved by giving the <a> (link) tag a title property containing the excerpt, and then the tooltip is produced by the browser. There's no way (on SE's end anyway, the browser could theoretically be changed to do it) for this tooltip to support MathJax: the browser just reads the title attribute as plain text.
• In principle it could be changed on SE's end by replacing standard title attributes by custom tooltips, like the one they use for Impact number in the profile and a few other fields. Those are regular divs that are made to appear on hover, and could be mathjax-processed as the rest. Of course, one probably would not want to have randomly cut-off formulas rendered in weird ways, anyway. – user147263 Mar 21 '16 at 15:54