http://trac.webkit.org/changeset/75512 seems to have caused a regression in painting, or layout. I'm not sure which. steps to repro: 1) wk2 window, http://www.businessinsider.com/katy-perry-facebook-2011-1#katy-steps-up-to-facebooks-photo-setup--1 2) use the > and < buttons to make your way through the pictures results: flickering of the div containing the leading caption and the photo. you can see it flicker briefly between the current picture, the previous picture, and back to the current picture. <rdar://problem/8896882>