Test http://www.w3.org/2001/DOM-Test-Suite/level2/core/getElementById02

<test name='getElementById02' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-2 dom2.xsd'>
     <metadata>
          <title>getElementById02</title>
          <creator>NIST</creator>
          <description> The "getElementById(elementId)" method for a Document should return null if elementId does not identify any elements in this document. Invoke method getElementById(elementId) on this document with elementId equals "Cancun". Method should return null. </description>
          <contributor>Mary Brady</contributor>
          <date qualifier='created'>2001-08-17</date>
          <subject resource='http://www.w3.org/TR/DOM-Level-2-Core/core#ID-getElBId'/>
</metadata>
     <var name='doc' type='Document'/>
     <var name='element' type='Element'/>
     <load var='doc' href='staffNS' willBeModified='false'/>
     <getElementById interface='Document' obj='doc' var='element' elementId='"Cancun"'/>
     <assertNull actual='element' id='throw_Null'/>
</test>

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