Implementation

List<Rectangle> getClientRects() {  var value = _getClientRects();  // If no prototype we need one for the world to hookup to the proper Dart class.  var jsProto = JS('', '#.prototype', value);  if (jsProto == null) {    JS('', '#.prototype = Object.create(null)', value);  }  applyExtension('DOMRectList', value);  return value;}