I\'m working on an HTML page that needs to be more or less pixel-perfect, and I noticed that in Opera 10, fonts are rendering larger than they do in other browsers, even tho
I'm not reproducing your problem. This is what I get in Firefox 3.6.8 (and in Internet Explorer 8):
I was having a similar issue.
I found that the default computed font size in FF and most other browsers on is 16px, but on opera the default seems to be 20px.
I simply set font-size:16px; for html, and it seemed to take care of it.