User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-GB; rv:1.9b4) Gecko/2008030317 Firefox/3.0b4 Build Identifier: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-GB; rv:1.9b4) Gecko/2008030317 Firefox/3.0b4 I have a set of pages (example will be attached) which use divs with the moz-border-radius property set. Under Firefox 3beta4 the corners of these borders sometimes do not join up. The smallest test case I can reproduce is a border on a div using a sans-serif font where the overflow property is set to auto. Reproducible: Always Steps to Reproduce: 1. Create div with moz-border-radius set. 2. Use sans-serif font 3. Set overflow to auto. 4. Drag window to resize it and look at the corners Actual Results: At certain sizes the corners of the divs don't join up.

This file shows the problem on Firefox 3beta4 on OSX. I haven't checked on other platforms.

These images are taken from the same page just resized slightly to make the problem appear or disappear.

This regressed in the last days of April 2007 so it is probably a regression from bug 368247.

For me (on winXP) overflow:auto is enough to trigger the bug. Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b5pre) Gecko/2008032605 Minefield/3.0b5pre

Not a bug at the moment -- overflow:auto ends up creating a new widget within the border area, and so it causes the border corners to be overpainted. Compositor should fix this.

WFM on trunk; I think the relevant piece of Compositor has landed, so I'm closing it. Feel free to reopen if you can still reproduce.