Web/API/WakeLockSentinel/released

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The read-only released property of the WakeLockSentinel interface returns a boolean that indicates whether a WakeLockSentinel has been released yet.

Syntax

var released = sentinel.released;

Value

A Boolean. Its value is false until the WakeLockSentinel has been released (either through a call to WakeLockSentinel.release() or because the lock has been released automatically) and the WakeLockSentinel.onrelease event has been emitted, after which it becomes true and no longer changes.

Examples

This example shows how released's value changes within a WakeLockSentinel's life cycle.

const sentinel = await navigator.wakeLock.request('screen');
console.log(sentinel.released);  // Logs "false"

sentinel.onrelease = () => {
  console.log(sentinel.released);  // Logs "true"
};

await sentinel.release();

Specifications

Specification	Status	Comment
Screen Wake Lock APIThe definition of 'released' in that specification.	Editor's Draft	Initial definition.

Browser compatibility

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
released Experimental'	Chrome Full support 87	Edge Full support 87	Firefox No support No	IE No support No	Opera Full support Yes	Safari No support No	WebView Android Full support 87	Chrome Android Full support 87	Firefox Android No support No	Opera Android Full support Yes	Safari iOS No support No	Samsung Internet Android No support No

Legend

Full support  

Full support

No support  

No support

Experimental. Expect behavior to change in the future.'

Experimental. Expect behavior to change in the future.

WakeLockSentinel.released by Mozilla Contributors is licensed under CC-BY-SA 2.5.