[Webkit-unassigned] [Bug 187445] New: Video hides when on last frame and hiding showing page visibility

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187445

            Bug ID: 187445
           Summary: Video hides when on last frame and hiding showing page
                    visibility
           Product: WebKit
           Version: Safari 11
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tombigel at wix.com

Created attachment 344542

  --> https://bugs.webkit.org/attachment.cgi?id=344542&action=review

demo to reproduce bug

To reproduce:
1. Play an mp4 video in Safari (tested on MacOS 10.13, Safari 11 and Safari 12 Preview) 
2. Wait for the video to end and show last frame
3. Switch tab or application window (trigger a visibilitychange "hidden" event)
4. Switch back to the video tab

Result:
The video disappears from the page view
- The video is still in the dom and still interactive.
- Any change to the video - seeking, playing etc shows the video again

Notes:
While playing with this I noticed the last frame of the video is a point of inconsistent behaviour - 
Skip to last frame while playing and the video view freezes in current frame, sometimes it skips to "almost" the last frame, sometimes the video disappears while skipping to the last frame.
Should be investigated a bit more and worth another bug if there isn't any.

see attached html file, online codepen version here - https://codepen.io/tombigel/pen/BVXVpX

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