Why does the screen backlight turn off when watching Youtube?

I

Ilaj Osmanov2016-12-30 20:31:49

macOS

Ilaj Osmanov, 2016-12-30 20:31:49

The situation is this: as soon as I launch the video on YouTube, then after a couple of seconds the screen backlight turns off. What could it be .

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D

Dmitry Krymtsev, 2016-12-30
@krimtsev

what device do you have? no plugins? Are there any nutritional problems?
there is a problem on the iPhone (although in OS X tags), it is repaired like this: settings-display-backlight.