Slide 58
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CSS Transition vs Animated
https://developer.mozilla.org/en-US/docs/Web/Apps/Fundamentals/Performance/CSS_JavaScript_animation_performance
> Even given the test results above, we'd argue that
CSS animations are the better choice. But how? The
key is that as long as the properties we want to
animate do not trigger reflow/repaint (read CSS
triggers for more information), we can move those
sampling operations out of the main thread.