Test http://www.w3.org/2001/DOM-Test-Suite/level3/core/nodereplacechild20

<test name='nodereplacechild20' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-3 dom3.xsd'>
     <metadata>
          <title>nodereplacechild20</title>
          <creator>IBM</creator>
          <description> Using replaceChild on a DocumentFragment node attempt to replace an Element node with an Attr Node and verify if a HIERARCHY_REQUEST_ERR is thrown. </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#ID-785887307'/>
</metadata>
     <var name='doc' type='Document'/>
     <var name='docFrag' type='DocumentFragment'/>
     <var name='attr' type='Attr'/>
     <var name='elem' type='Element'/>
     <var name='replaced' type='Element'/>
     <var name='nodeName' type='DOMString'/>
     <var name='appendedChild' type='Node'/>
     <load var='doc' href='hc_staff' willBeModified='true'/>
     <createDocumentFragment var='docFrag' obj='doc'/>
     <createElementNS var='elem' obj='doc' namespaceURI='"http://www.w3.org/1999/xhtml"' qualifiedName='"dom3:p"'/>
     <createAttributeNS var='attr' obj='doc' namespaceURI='"http://www.w3.org/XML/1998/namespace"' qualifiedName='"xml:lang"'/>
     <appendChild obj='docFrag' var='appendedChild' newChild='elem'/>
     <assertDOMException id='throw_HIERARCHY_REQUEST_ERR'>
          <HIERARCHY_REQUEST_ERR>
               <replaceChild var='replaced' obj='docFrag' oldChild='elem' newChild='attr'/>
          </HIERARCHY_REQUEST_ERR>
     </assertDOMException>
</test>

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