The requestIdleCallback() API queues a function that runs in idle browser time, either at the end of a frame or when the user is inactive. Also known as the background tasks API.

Learning resources on MDN

• Window: requestIdleCallback() method

Browser support (view on caniuse.com)

• Chrome 47 Released on 2015-12-01
• Chrome Android 47 Released on 2015-12-02
• Edge 79 Released on 2020-01-15
• Firefox 55 Released on 2017-08-08
• Firefox for Android 55 Released on 2017-08-08
• Safari ❌ See webkit.org/b/164193
• Safari on iOS ❌ See webkit.org/b/164193

Baseline availability blocked since January 2020 by Safari (59 months)

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