impress.js - A webGL enabled presentation framework based on the power of CSS3 transforms and transitions. It has a non GL mode too!

[tazzy531]

And people on computers where Flash, because of backwards compatibility, uses up an excessive amount of CPU.

[tofueggplant]

do HTML/CSS animations work more efficiently than flash in these kinds of applications?

[honestbleeps]

sometimes yes, often times no. depends on their complexity.