body { scroll-behavior: smooth } coming to Chrome.
Also... window.scrollTo(0, 600, 'smooth')

This is part of the CSSOM View smooth scroll API!topic/blink-dev/YLWs9N46XjQ

This means things like #fragment links can be scrolled to smoothly by default now, no JS required. Also no more updating scrollTop in JS, Chrome can do it for you, making the whole experience WAY faster for your users. via +Eric Bidelman 
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