How NoSleepScreen Uses It
When you press Start, NoSleepScreen calls navigator.wakeLock.request("screen"). If the browser grants the request, the page keeps screen on until you stop it, close the tab, or the browser releases it.
Guide
Wake Lock API Guide
The Wake Lock API lets supported browsers request that a screen stay awake while a web page is active.
Graceful Fallbacks
If the API is not available, the tool shows a clear unsupported-browser message instead of failing silently.
Privacy
The Wake Lock API does not require personal data. NoSleepScreen does not need to know who you are to prevent screen sleep.