Go to the link. Set the video to full screen and then don't move the mouse. Once the top title bar and the bottom control bars slide off, I can no longer press ESC to exit full screen, click to pause, move the mouse to see the cursor and bring back the top/bottom bars.
To get out, Command-TAB will get you out or if you select Webkit while Command-Tabbing you can quickly press ESC to get the video out of full screen.
*** Bug 107279 has been marked as a duplicate of this bug. ***
Oops, my fault.
Sam's refactoring in bug 107216 fixes this. Will mark as a duplicate once it's clear that it can be landed soon. Otherwise, I will just fix this regression.
Created attachment 183568 [details]
Ok, Sam seems busy, so just fixing this issue.
Fixed in <http://trac.webkit.org/changeset/140220>.