Steps to reproduce: 1. Go to bug url 2. Make sure Window is wide enough to see blue/black vertically striped background. 3. Move window from back and forth horizontally Expected results: It should be smooth Actual results: The background flashes Tested with r32901 Note, it may just be an optical illusion
(In reply to comment #0) > Note, it may just be an optical illusion Sort of. It's an artifact of LCDs' response time. One way to verify that it is not a WebKit issue is to take a screenshot of the Safari window, open it in Preview (at full size) and drag the Preview window around. Not the first time this has been reported on bugs.webkit.org, but I could not find the duplicate.