Google rolls out Chrome 63 for Android, here is what's new
As far as changes go, Chrome 63 is supposed to enhance existent features like autocompletion (in the address bar), but there's also a new Device Memory JavaScript API, which makes it easier for websites to tell the amount of RAM on a user's device so that devs can optimize them for smoother browsing.
Furthermore, Google states that some under-the-hood performance improvements have also been implemented, along with some stability enhancements. Unfortunately, there's no mention of HDR video support, as previously rumored, so we'll probably have to wait until the next version of Chrome.
source: Google
Things that are NOT allowed: