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Re:There is a pure HTML Gmail, and it still works by userbinator on Wednesday April 02, 2014 @05:06AM (#7514331)
> it's Turing-complete so long as you consider an appropriate accompanying HTML file and user interactions

In other words, CSS won't just sit there and consume CPU cycles unless you actively interact with the page, unlike JS. The highest-voted comment on the first answer there says that a bit more explicitly.

Re:There is a pure HTML Gmail, and it still works by CJefferson on Wednesday April 02, 2014 @05:18AM (#7514366)
CSS animations will certainly consume CPU cycles