CSS Animation is sometimes said to be Flash-replacement for certain areas. I doubt how flexible its animation can be : presentation flexibility, performance, resource usage, and so on.
The WebKit blog article introduces the CSS animation in very easy-reading style. Probably most of advertisement flash can be replaced with this CSS animation, and it would get rid of lots of burden from web browsers. Especially Korean web sites use flash-advertisement very heavily. They are even obstructive. I want them not to use that many advertisement in such obstructive way. But if they once do it, I want it not to degrade web browser responsiveness.
Web developers! Study the CSS animation!!!!!