[Webkit-unassigned] [Bug 172762] New: YouTube video screen freezes after 3 seconds when mouse does not move

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=172762

            Bug ID: 172762
           Summary: YouTube video screen freezes after 3 seconds when
                    mouse does not move
           Product: WebKit
           Version: Safari 10
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: roland at nextendweb.com

When I'm viewing any YouTube video in Safari the screen freezes after the mouse not moved for 3 seconds. The sound of the video in the background continue to play, just the video freezed. When I'm moving the mouse all the time the video plays just fine, but it isn't normal.

Here is a video demonstration of the issue: https://www.youtube.com/edit?o=U&video_id=3U5eW-4Orrk

This issue is haunting me for ages. I have a Macbook Air 2014 early and the problem started to happen 2 years ago. Now I have a brand new Macbook Air 2015 early and the same issue happens. It isn't happen all the time, but when it starts to freeze, you can not make it stop. Restart solves it and sometimes the sleep.

MacOs 10.12.6
Safari: 10.1.2 (12603.3.1) 

I do not have any browser extension installed into Safari. Also Chrome doesn't produce the same issue.

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