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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 - Promise callbacks should be called at microtask checkpoints"
   href="https://bugs.webkit.org/show_bug.cgi?id=147933">147933</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Promise callbacks should be called at microtask checkpoints
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>528+ (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>JavaScriptCore
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>jaffathecake&#64;gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Here is a demo of the issue: <a href="http://jsbin.com/kaqume/1/edit?js,console,output">http://jsbin.com/kaqume/1/edit?js,console,output</a>

Click the blue square. The `promise` logs should appear before the `mutate` logs. The correct ordering is:

&quot;click&quot;
&quot;promise&quot;
&quot;mutate&quot;
&quot;click&quot;
&quot;promise&quot;
&quot;mutate&quot;
&quot;timeout&quot;
&quot;timeout&quot;

The microtask queue should be emptied once a listener callback has finished, before returning to spec prose. Promise callbacks seem to run on a different queue in WebKit.</pre>
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      </p>
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