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This is an experimental technology
Check the Browser compatibility table carefully before using this in production.


The window.cancelIdleCallback() method cancels a callback previously scheduled with window.requestIdleCallback().




The ID value returned by window.requestIdleCallback() when the callback was established.

Return value



See our complete example in the article Cooperative Scheduling of Background Tasks API.


Specification Status Comment
Cooperative Scheduling of Background Tasks Proposed Recommendation Initial definition.

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 47 No support 55 (55) No support (Yes) No support
Feature Android Webview Chrome for Android Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile
Basic support 47 47 55.0 (55) No support No support ? No support

cancelIdleCallback() support was added in Firefox 53, but was disabled by default. It was later enabled by default in Firefox 55.

Document Tags and Contributors

 Contributors to this page: jpmedley, myakura, Sheppy, Permutator, Jinva, rolfedh
 Last updated by: jpmedley,