Test http://www.w3.org/2001/DOM-Test-Suite/level3/core/nodesetuserdata09

<test name='nodesetuserdata09' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-3 dom3.xsd'>
     <metadata>
          <title>nodesetuserdata09</title>
          <creator>IBM</creator>
          <description> Invoke setUserData on this documentElement node to set its UserData to this Document node. Invoke getUserData on this Document node with the same key of the UserData that was just set on the documentElement node and verify if the returned node is null. </description>
          <contributor>Neil Delima</contributor>
          <date qualifier='created'>2002-06-10</date>
          <subject resource='http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/core#Node3-setUserData'/>
</metadata>
     <var name='doc' type='Document'/>
     <var name='docElem' type='Element'/>
     <var name='returned' type='DOMUserData'/>
     <var name='nullHandler' type='UserDataHandler' isNull='true'/>
     <var name='retUserData' type='DOMUserData'/>
     <load var='doc' href='hc_staff' willBeModified='true'/>
     <documentElement var='docElem' obj='doc'/>
     <setUserData obj='docElem' var='retUserData' key='"Key1"' data='doc' handler='nullHandler'/>
     <getUserData var='returned' obj='doc' key='"Key1"'/>
     <assertNull actual='returned' id='nodesetuserdata09'/>
</test>

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