Test http://www.w3.org/2001/DOM-Test-Suite/level2/core/prefix01

<test name='prefix01' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-2 dom2.xsd'>
     <metadata>
          <title>prefix01</title>
          <creator>NIST</creator>
          <description> The "getPrefix()" method for a Node returns the namespace prefix of the node, and for nodes of any type other than ELEMENT_NODE and ATTRIBUTE_NODE and nodes created with a DOM Level 1 method, this is null. Create an new Element with the createElement() method. Invoke the "getPrefix()" method on the newly created element node will cause "null" to be returned. </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-NodeNSPrefix'/>
</metadata>
     <var name='doc' type='Document'/>
     <var name='createdNode' type='Node'/>
     <var name='prefix' type='DOMString'/>
     <load var='doc' href='staffNS' willBeModified='false'/>
     <createElement obj='doc' tagName='"test:employee"' var='createdNode'/>
     <prefix obj='createdNode' var='prefix'/>
     <assertNull actual='prefix' id='throw_Null'/>
</test>

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