Test http://www.w3.org/2001/DOM-Test-Suite/level1/core/nodegetownerdocumentnull

<test name='nodegetownerdocumentnull' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-1 dom1.xsd'>
     <metadata>
          <title>nodeGetOwnerDocumentNull</title>
          <creator>NIST</creator>
          <description> The "getOwnerDocument()" method returns null if the target node itself is a document. </description>
          <contributor>Mary Brady</contributor>
          <date qualifier='created'>2001-08-17</date>
          <subject resource='http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core#node-ownerDoc'/>
</metadata>
     <var name='doc' type='Document'/>
     <var name='ownerDocument' type='Document'/>
     <load var='doc' href='staff' willBeModified='false'/>
     <ownerDocument obj='doc' var='ownerDocument'/>
     <assertNull actual='ownerDocument' id='documentOwnerDocumentNull'/>
</test>

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