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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Full screen videos are hidden when a parent node has animation"
   href="https://bugs.webkit.org/show_bug.cgi?id=150134">150134</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Full screen videos are hidden when a parent node has animation
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Macintosh
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Mac OS X 10.10
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Layout and Rendering
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>david.zhang&#64;appdirect.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Steps to reproduce:
1. Go to <a href="https://www.appdirect.com/apps/577#!overview">https://www.appdirect.com/apps/577#!overview</a>
2. Click on &quot;Watch Demo&quot;
3. Click &quot;Full screen&quot; in the Youtube player

Expected:
Full screen video player

Actual:
Browser is full screen, video player is hidden

Workaround:
Either removing the animation/-webkit-animation property from the .adb-modal selector, or adding this CSS solves the problem:

:-webkit-full-screen-ancestor:not(iframe) {
    animation-name: none !important;
}

So I believe the problem is just that this style is missing from WebCore/css/fullscreen.css, since it already clears transform and transition for the same selector.</pre>
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