How Chrome learns when to autoplay video or block it

From CNET

Google Chrome lapel pin

Stephen Shankland/CNET

When Google released Chrome 66 in April, it clamped down on lots of websites that tried to play video and audio automatically. But the browser doesn’t always block autoplay, and on Thursday, Google detailed how Chrome learns which sites to squelch.

Chrome begins with a list of more than a thousand sites where Google found that the browser’s users typically played audio or video with sound. Then, as you browse the web, Chrome updates that list as it learns where you play media and where you don’t.

“As you teach Chrome, you may find that you need to click ‘play’ every now and then, but overall the new policy blocks about half of unwanted autoplays, so you will have fewer surprises and less unwanted noise when you first arrive at a website,” John…

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