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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 - [css-grid] Crash when using 'stretch' content alignment on flex tracks"
   href="https://bugs.webkit.org/show_bug.cgi?id=154265">154265</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[css-grid] Crash when using 'stretch' content alignment on flex tracks
          </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>Layout and Rendering
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>jfernandez&#64;igalia.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>simon.fraser&#64;apple.com
          </td>
        </tr></table>
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        <pre>Created <span class=""><a href="attachment.cgi?id=271388" name="attach_271388" title="Test case to reproduce the issue.">attachment 271388</a> <a href="attachment.cgi?id=271388&amp;action=edit" title="Test case to reproduce the issue.">[details]</a></span>
Test case to reproduce the issue.

When using 'stretch' for content alignment on grid containers with flex tracks, which size is a fraction unit, an assertion is violated which makes the browser crash when used in debug mode (also in release mode and assertions enabled).</pre>
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