Test http://www.w3.org/2001/DOM-Test-Suite/level2/html/HTMLObjectElement20

<test name='HTMLObjectElement20' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-2 dom2.xsd'>
     <metadata>
          <title>HTMLObjectElement20</title>
          <creator>NIST</creator>
          <description> The contentDocument attribute specifies the document this object contains, if there is any and it is available, or null otherwise. </description>
          <contributor>Rick Rivello</contributor>
          <date qualifier='created'>2002-07-03</date>
          <subject resource='http://www.w3.org/TR/DOM-Level-2-HTML/html#ID-38538621'/>
</metadata>
     <var name='testNode' type='Element'/>
     <var name='cd' type='Document'/>
     <var name='vtitle' type='DOMString'/>
     <var name='doc' type='Document'/>
     <var name='nodeList' type='NodeList'/>
     <load var='doc' href='object2' willBeModified='false'/>
     <getElementsByTagName var='nodeList' obj='doc' interface='Document' tagname='"object"'/>
     <item var='testNode' obj='nodeList' index='1' interface='NodeList'/>
     <contentDocument interface='HTMLObjectElement' obj='testNode' var='cd'/>
     <assertNull actual='cd' id='noContentDocument'/>
</test>

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