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Neat trick by Tobias Ahlin:
How do you animate the box-shadow property in CSS without causing re-paints on every frame, and heavily impacting the performance of your page? Short answer: you don’t. Animating a change of box-shadow will hurt performance.
There’s an easy way of mimicking the same effect, however, with minimal re-paints, that should let your animations run at a solid 60 FPS: animate the opacity of a pseudo element.