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Screen Wake Lock
The Screen Wake Lock API prevents the screen from locking, dimming, or turning off, which most mobile devices do to prolong battery life.
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if ('wakeLock' in navigator) {...}
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wakeLock = await navigator.wakeLock.request('screen');
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wakeLock.addEventListener('release', () => {/*...*/});
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await wakeLock.release();
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document.addEventListener('visibilitychange', () => {/*...*/});