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      <base href="https://bugs.webkit.org/" />
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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 - Return null when window.open() is popup blocked"
   href="https://bugs.webkit.org/show_bug.cgi?id=162897">162897</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Return null when window.open() is popup blocked
          </td>
        </tr>

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

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

        <tr>
          <th>Version</th>
          <td>Safari Technology Preview
          </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>zcorpan&#64;gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>cdumez&#64;apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>The return value of window.open() when the popup is blocked should be null.

WebKit/Chromium return undefined.
Gecko/Edge 13 return null.

See
<a href="https://github.com/whatwg/html/pull/1854">https://github.com/whatwg/html/pull/1854</a>
<a href="https://github.com/whatwg/html/issues/1851">https://github.com/whatwg/html/issues/1851</a>

Test
<a href="http://software.hixie.ch/utilities/js/live-dom-viewer/saved/4541">http://software.hixie.ch/utilities/js/live-dom-viewer/saved/4541</a></pre>
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