[Webkit-unassigned] [Bug 165243] New: The video which is rendered by HTML template would be black when paused

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=165243

            Bug ID: 165243
           Summary: The video which is rendered by HTML template would be
                    black when paused
    Classification: Unclassified
           Product: WebKit
           Version: Safari 10
          Hardware: iPhone / iPad
                OS: iOS 10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jiangshanyanyuwhn at gmail.com

The video which is rendered by HTML template would be black when paused.

example: https://thekingofgods.github.io/bugs/video-1.html

core code:
  var elBox = document.getElementById('box');
  var tpl = document.createElement('template');
  var documentFragment;

  tpl.innerHTML = '<video src="http://XX" controls playsinline preload="metadata">';
  documentFragment = tpl.content;
  elBox.appendChild(documentFragment);

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