I have a lovely Star Trek Red Alert animation using CSS3. One of my parent elements has a border-radius along with overflow:hidden so that any con
border-radius
overflow:hidden
You could put an absolute positioned div over it with a border-radius and a thick black border, it will block the parts you want too be hidden.
I made a demo for another question about a similar problem in FF3.6: http://jsfiddle.net/vfp3v/15/
border-radius; overflow: hidden, and text is not clipped