Created attachment 105126 [details] Reduced test case When I have a tag with a repeating background-image and a border with the dotted style, the background image rendering breaks and shows severe artifacts depending on the width of the window (and independently of the width of the element itself). Open the attached test case and resize the window to get a glimpse of it. I'm fairly sure this is a regression as this at least works with the current (13 dot something) release of Chrome, even though it seems to happen with both the nightly webkit and my standard Safari install.
Created attachment 105128 [details] Screenshots of what I get The artifacts come in 3 flavors depending on the size of the window.
I can reproduce in Safari 5.1 or ToT in multi-process mode, but not in single process mode. If this doesn't happen for you at first, try resizing the page.
<rdar://problem/10020762>
This turned out to be an issue in other system frameworks, not in WebKit. Keeping open for now in case we can add a workaround.
This is fixed in OS X 10.8. Marking INVALID as a non-WebKit issue.