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

A boolean value, that 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 release event has been emitted, after which it becomes true and no longer changes.

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();