Evaluate XPath in a Browser

// Evaluating an XPath Expression in the browser (tested in Firefox)
// For Cross-Browser stuff, check the small library Sarissa.js (http://dev.abiss.gr/sarissa/)
var doc = new DOMParser().parseFromString("<root><a>A<b/>A<c/></a><b/></root>", "text/xml")
var iterator = doc.evaluate('//b', doc.documentElement, null,XPathResult.ANY_TYPE, null );
console.log(iterator)
try {
  var thisNode = iterator.iterateNext();

  while (thisNode) {
    console.log( thisNode );
    thisNode = iterator.iterateNext();
  }
}
catch (e) {
  dump( 'Error: Document tree modified during iteration ' + e );
}