Test http://www.w3.org/2001/DOM-Test-Suite/level2/html/HTMLButtonElement02

<test name='HTMLButtonElement02' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-1 dom1.xsd'>
     <metadata>
          <title>HTMLButtonElement02</title>
          <creator>NIST</creator>
          <description> The form attribute returns null if control in not within the context of form. Retrieve the form attribute and examine its value. </description>
          <contributor>Mary Brady</contributor>
          <date qualifier='created'>2002-02-22</date>
          <subject resource='http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-html#ID-71254493'/>
</metadata>
     <var name='nodeList' type='NodeList'/>
     <var name='testNode' type='Node'/>
     <var name='vform' type='HTMLFormElement'/>
     <var name='doc' type='Document'/>
     <load var='doc' href='button' willBeModified='false'/>
     <getElementsByTagName interface='Document' obj='doc' var='nodeList' tagname='"button"'/>
     <assertSize collection='nodeList' size='2' id='Asize'/>
     <item interface='NodeList' obj='nodeList' var='testNode' index='1'/>
     <form interface='HTMLButtonElement' obj='testNode' var='vform'/>
     <assertNull actual='vform' id='formNullLink'/>
</test>

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