It's not clear if this is web compatible, but conceptually, it doesn't make sense to be running requestAnimationFrame inside display:none iframes.

WebKit tried this for both display:none and 0x0 iframes and had to revert. I'm hoping it was the 0x0 that was the problem, not the display:none. http://jsbin.com/jolatibebe/1/edit?html,output

IMO, we should consider doing this for display:none and see if it breaks that page.