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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - space-evenly misbehaves with flexbox"
   href="https://bugs.webkit.org/show_bug.cgi?id=170445">170445</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>space-evenly misbehaves with flexbox
          </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>CSS
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>florian&#64;rivoal.net
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=306166" name="attach_306166" title="failing test case">attachment 306166</a> <a href="attachment.cgi?id=306166&amp;action=edit" title="failing test case">[details]</a></span>
failing test case

&quot;justify-content: space-evenly&quot; is implemented for grid layout, but not for flexbox, where instead it behaves as flex-start.

However, since it parses correctly, it is not possible to use the cascade (or &#64;supports) fallback on some other value, making something like this unusable:

.foo {
  display: flex;
  justify-content: space-around; /* fallback if the next line is not supported */
  justify-content: space-evenly;
}

Ideally, space-evenly should be implemented in full for flexbox as well (mozilla already has it), but if that's too consuming for a quick fix, as a stop gap measure, using its default fallback alignment (center) would be much better than flex-start. Using space-around would probably be OK as well, as these two values are somewhat close.

I've attached a test-case (also submitted to wpt <a href="https://github.com/w3c/web-platform-tests/pull/5336">https://github.com/w3c/web-platform-tests/pull/5336</a>) that currently fails, and would pass if either a full implementation was done, or if a fallback to either center or space-around was implemented instead.</pre>
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