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As of 2020, mobile phone browsers still mostly lack the ability to play HTML5 video in background (to only hear the audio).

But here is a solution that might work:

javascript:(window.setTimeout(function() { document.getElementsByTagName("video")[0].play();}, 3000));void(0);

This bookmarklet first waits three seconds (to switch the tab), then starts playback in background.

As of 2020, mobile phone browsers still mostly lack the ability to play HTML5 video in background (to only hear the audio). But here is a solution that might work: `javascript:(window.setTimeout(function() { document.getElementsByTagName("video")[0].play();}, 3000));void(0);` This bookmarklet first waits three seconds (to switch the tab), then starts playback in background.

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[–] • 1 pt

I have noticed that if YouTube AutoPlay is enabled, and one switches the tab while the five-second countdown to the next video is running, it starts playing in background. (Chrome and Brave)