The video lengthened its height and results the click action position shift then fails

the very same URL in three windows which is playing exactly the same video.
but the middle one is a bit taller that misleads me to think the relative click action failed.
whenever I move the safari window to the centre of the screen, it happens that way …
what happened exactly ?

Isn’t is just that the centre browser window is wider than the other two, therefore leaving more room for the video which YouTube expands to fill the extra space?

If you want the video to have the same screen dimensions (width, height) make sure to keep the browser window constant in width.

Yes, you maybe right.
I use AppleScript to resize and reposition the windows.
probably that I did not strictly construct the exact dimension of width of the middle one.
Thanks man !
スクリーンショット 2023-08-13 午後3.23.14

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you are correct !
the dimensions are same now. so the bug of the relative click position doesn't exist anymore ><"

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