gecko-dev/parser/htmlparser/tests/crashtests/121591-1.html

<HTML>
<body>
<span>
<head><link></head>
   <table border=1>
    <tr><td>
     <table border=1 align="left">
      <tr><td></td></tr>
      <tr><td>
	  <form>
	    <button></button>
      </form>
      </td></tr>
     </table>
    </td></tr>
   </table>
</span>
</body>
</html>