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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Implement MediaError message attribute"
   href="https://bugs.webkit.org/show_bug.cgi?id=170761">170761</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Implement MediaError message attribute
          </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>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </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>Media Elements
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>philip&#64;foolip.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre><a href="https://html.spec.whatwg.org/multipage/embedded-content.html#error-codes">https://html.spec.whatwg.org/multipage/embedded-content.html#error-codes</a>

This was discussed and added to HTML in January 2017:
<a href="https://github.com/whatwg/html/issues/2085">https://github.com/whatwg/html/issues/2085</a>
<a href="https://github.com/whatwg/html/pull/2086">https://github.com/whatwg/html/pull/2086</a>
<a href="https://github.com/w3c/web-platform-tests/pull/4638">https://github.com/w3c/web-platform-tests/pull/4638</a>

It is already in Gecko and about to ship in Chromium:
<a href="https://github.com/mozilla/gecko-dev/blob/master/dom/webidl/MediaError.webidl">https://github.com/mozilla/gecko-dev/blob/master/dom/webidl/MediaError.webidl</a>
<a href="https://groups.google.com/a/chromium.org/d/msg/blink-dev/yDIyWozG1xk/LKZqEkpoBAAJ">https://groups.google.com/a/chromium.org/d/msg/blink-dev/yDIyWozG1xk/LKZqEkpoBAAJ</a></pre>
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