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Why does the screen go black for a few seconds when going from normal mode to fullscreen?

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When I go from normal mode in YouTube to the fullscreen mode the screen is black for like 1 second, why? It's so annoying I'm thinking of switching browser. Please help :)

When I go from normal mode in YouTube to the fullscreen mode the screen is black for like 1 second, why? It's so annoying I'm thinking of switching browser. Please help :)

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It is your screen moving from windowed to fullscreen all computers do it nothing to worry about