With the setting enabled, YouTube’s background turns from white to black throughout the YouTube experience as you navigate, search and browse its app. The setting is meant to give YouTube a more cinematic feel, but it has other advantages, as well. It can be a bit easier on the eyes to use a dark theme when you’re staring at a screen for a long period of time, for example, and it can help you to better focus on the content, not the controls. Some tests have also shown dark themes to save battery life — that’s helpful for an app like YouTube where users are spending more than an hour per day watching videos on mobile devices. YouTube says its dark theme will cut down on glare and allow viewers to take in the true colors of the videos they watch on mobile.
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