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   1  
   2  // Node.prototype.contains
   3  (function() {
   4  
   5  	function contains(node) {
   6          if (!(0 in arguments)) {
   7              throw new TypeError('1 argument is required');
   8          }
   9  
  10          do {
  11              if (this === node) {
  12                  return true;
  13              }
  14          // eslint-disable-next-line no-cond-assign
  15          } while (node = node && node.parentNode);
  16  
  17          return false;
  18      }
  19  
  20      // IE
  21      if ('HTMLElement' in self && 'contains' in HTMLElement.prototype) {
  22          try {
  23              delete HTMLElement.prototype.contains;
  24          // eslint-disable-next-line no-empty
  25          } catch (e) {}
  26      }
  27  
  28      if ('Node' in self) {
  29          Node.prototype.contains = contains;
  30      } else {
  31          document.contains = Element.prototype.contains = contains;
  32      }
  33  
  34  }());