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   1  (function() {
   2  
   3  	function contains(node) {
   4          if (!(0 in arguments)) {
   5              throw new TypeError('1 argument is required');
   6          }
   7  
   8          do {
   9              if (this === node) {
  10                  return true;
  11              }
  12          } while (node = node && node.parentNode);
  13  
  14          return false;
  15      }
  16  
  17      // IE
  18      if ('HTMLElement' in this && 'contains' in HTMLElement.prototype) {
  19          try {
  20              delete HTMLElement.prototype.contains;
  21          } catch (e) {}
  22      }
  23  
  24      if ('Node' in this) {
  25          Node.prototype.contains = contains;
  26      } else {
  27          document.contains = Element.prototype.contains = contains;
  28      }
  29  
  30  }());