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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Incorrect behavior when flex box item grows past container bounds"
   href="https://bugs.webkit.org/show_bug.cgi?id=151965">151965</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Incorrect behavior when flex box item grows past container bounds
          </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>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Mac OS X 10.11
          </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>jonlee&#64;apple.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dino&#64;apple.com, hyatt&#64;apple.com, simon.fraser&#64;apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>(After 151957) If a flex box item grows such that the container has to be stretched past its bounds, subsequent flex box items are clipped.

The structure I have is (simplification of animometer structure):

&lt;body&gt;
    &lt;main&gt;
        &lt;div class=&quot;spacer&quot;&gt;&lt;/div&gt;
        &lt;div id=&quot;section-container&quot;&gt;&lt;/div&gt;
        &lt;div class=&quot;spacer&quot;&gt;&lt;/div&gt;
    &lt;/main&gt;
&lt;/body&gt;

html,body { height: 100%; }
main {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    flex-flow: column;
}
.spacer {
    flex: 1 0 20px;
    width: 10px;
}

If #section-container ends up being taller than the viewport (which is greater than the container bounds), the lower spacer is clipped off. This works in Firefox and Chrome.</pre>
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