Adding animations to web interfaces makes pages and apps feel more responsive and interactive. A side menu that smoothly slides out of view provides a much better user experience then a menu that just disappears when you close it.
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Getting Started With The JavaScript Web Animation API
Adding animations to web interfaces makes pages and apps feel more responsive and interactive. A side menu that smoothly slides out of view provides a much better user experience then a menu that just disappears when you close it.
Full article