Safari will be not full screen Youtube videos

For some reason when I open Youtube on Safari Web browser it will not full screen video. But the video as look size normal Youtube video in the upper left corner and the rest of the glance at the black screen. I try another video site but the game in full screen as usual with Safari, so that it comes with Youtube Web site only.

No solution, but some comments are in this thread:

Since the update of security this week, YouTube is not going fullscreen in Safari. Help?

It resembles a YouTube problem for me.

Tags: Mac OS & System Software

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