Google Chrome developers have added an intent to experiment with a feature that enables web applications to keep systems awake even in lack of mouse or keyboard activity. This is to be achieved through the WakeLock API, which allows requesting a wake lock that prevents devices from entering a power-saving state by lowering the screen brightness, turning off the screen, or reducing CPU cycles. Uses could “override the lock by switching to another tab or manually locking or powering off their display
Source: