1. Go to http://jasonlong.github.io/webkit-debug/ on iOS 7 2. Scroll down slightly An animation begins, but some of the animating elements have black borders drawn around them. This affects https://github.com/features but we made a standalone test case to be used to diagnose this bug.
The black borders do not appear in Safari 7.0.1 on OS X 10.9.1
They do if you zoom! *** This bug has been marked as a duplicate of bug 124541 ***
I see white pixels if I zoom on desktop, but true!