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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - sectionRowIndex must return -1 when its parent is not a table, tbody, thead, or tfoot"
   href="https://bugs.webkit.org/show_bug.cgi?id=148841">148841</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>sectionRowIndex must return -1 when its parent is not a table, tbody, thead, or tfoot
          </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>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&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>rniwa&#64;webkit.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>cdumez&#64;apple.com, webkit-bug-importer&#64;group.apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>See <a href="https://html.spec.whatwg.org/multipage/tables.html#dom-tr-sectionrowindex">https://html.spec.whatwg.org/multipage/tables.html#dom-tr-sectionrowindex</a>

When tr element's parent is not one of table, tbody, thead, or tfoot,
sectionRowIndex must return -1.

This bug was found by the newly imported test:
LayoutTests/http/tests/w3c/html/semantics/tabular-data/the-tr-element/sectionRowIndex.html</pre>
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