Fieldset does not support display: table / table-cell

Question

I\'m trying to use display: table with fieldset, but it\'s not scaling properly. The same thing works if I change

to

Answer 1

Basically, the default rendering of fieldset can't actually be expressed in CSS. As a result, browsers have to implement it in non-CSS terms, and that interferes with application of CSS to the element.

Pretty much any element that can't be recreated using pure CSS will have issues of that sort.