1<script> 2var doc = document.implementation.createHTMLDocument('a'); 3var b = document.createElement('b'); 4// Give it a node list cache on document 5b.childNodes; 6 7// Attach it to doc to update m_document 8doc.adoptNode(b); 9doc.body.appendChild(b); 10doc.body.removeChild(b); 11</script> 12<p>Close the document to see if there's an assertion failure.</p>