When opening any YouTube video fullscreen in Safari, white flash appears at the bottom of the screen for a second
The issue is not present when doing the same in chrome
Also, the issue is visible on a screen recording, so it can't be an issue with the screen itself
This image has flicker (bright area at the bottom):
And this is how the rest of the video looks like (dark area at the borrow, as it should be):
MacBook Pro Apple Silicon
Hi babilungam,
Thank you for using the Apple Support Communities! If you test in another user, does the same issue occur? Being able to see if the issue occurs in another user account will to identify if it is something that is affecting your entire system or just one particular user account. To do this, you'll want to set up a Test User account and then try to replicate the issue in that account.
1. Choose Apple menu > System Preferences, then click Users & Groups.
2. Click the lock icon, then enter an administrator name and password.
3. Click the add button (+) below the list of users.
4. Complete the fields shown for a Standard or Administrator account, then click Create Account (or OK).
5. Go back up to the Apple menu in the upper left of the computer and select "Log Out". At the login screen, choose the "Test User" just made.
6. Once inside the Test Account, try to replicate the issue to determine if it just occurs in one account or on the whole computer.
Thank you.
YouTube Fullscreen blinking with Safari browser
