I just learned today that a dotted or dashed border will render as solid for the rounded portions (specified by border-radius ) in Firefox. There is an open bug for this, but I haven't run across it until just now. So if you're wondering why you can't put a dotted border on that circle in firefox - that's why. Which looks like this in Firefox (screenshot from v21)
Lessons learned and interesting tidbits from my adventures in web development