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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Implement customElements.upgrade()"
   href="https://bugs.webkit.org/show_bug.cgi?id=183397">183397</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Implement customElements.upgrade()
          </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>HTML DOM
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned@lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>d@domenic.me
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>cdumez@apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Recently added to the spec: <a href="https://github.com/whatwg/html/pull/3535">https://github.com/whatwg/html/pull/3535</a>

Spec: <a href="https://html.spec.whatwg.org/multipage/custom-elements.html#dom-customelementregistry-upgrade">https://html.spec.whatwg.org/multipage/custom-elements.html#dom-customelementregistry-upgrade</a>

Tests: <a href="https://github.com/w3c/web-platform-tests/pull/9869">https://github.com/w3c/web-platform-tests/pull/9869</a></pre>
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