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wp-polyfill-node-contains.js (643B)

      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 }());