Google Chrome will now defer playback of autoplay media until the tab is foregrounded in the latest Dev Channel. This means no more "Where's that sound coming from?" moments when an ad for instance decides to autoplay in a tab you've specifically opened in the background.

Resources will still be preloaded if indicated but Chrome will delay the start of playback until you actually visit the tab.

This cool feature prevents obviously user annoyance but also conserves power as Chrome will only consume power once the tab is foregrounded.

Source: https://codereview.chromium.org/1292433002/
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