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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - td/th.headers and a/area.ping should be DOMTokenList"
   href="https://bugs.webkit.org/show_bug.cgi?id=157031">157031</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>td/th.headers and a/area.ping should be DOMTokenList
          </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>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></table>
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        <pre>See <a href="https://github.com/whatwg/html/issues/1026">https://github.com/whatwg/html/issues/1026</a>

headers and ping IDL attributes are strings but should be DOMTokenList.

Spec:
<a href="https://html.spec.whatwg.org/multipage/semantics.html#htmlanchorelement">https://html.spec.whatwg.org/multipage/semantics.html#htmlanchorelement</a>
<a href="https://html.spec.whatwg.org/multipage/embedded-content.html#htmlareaelement">https://html.spec.whatwg.org/multipage/embedded-content.html#htmlareaelement</a>
<a href="https://html.spec.whatwg.org/multipage/tables.html#htmltablecellelement">https://html.spec.whatwg.org/multipage/tables.html#htmltablecellelement</a>

Simple test:

&lt;!DOCTYPE html&gt;
&lt;a id=a ping=&quot;x y&quot;&gt;&lt;/a&gt;
&lt;table&gt;&lt;tr&gt;&lt;td id=td headers=&quot;z&quot;&gt;&lt;/table&gt;
&lt;script&gt;
alert(a.ping instanceof DOMTokenList);
alert(td.headers instanceof DOMTokenList);
&lt;/script&gt;

Test:
<a href="http://w3c-test.org/html/dom/interfaces.html">http://w3c-test.org/html/dom/interfaces.html</a></pre>
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