[identity profile] skington.livejournal.com 2010-07-22 09:49 pm (UTC)(link)
I went to YouTube. Performance was not good ;-). But it's impressive that it works at all - I assume it's a combination of overlaying the normal page with an opaque canvas, passing events through, and what I expect is an un-hardware-accelerated process of capturing the contents of the page behind the canvas element and rotating it.