(function ( ElementProto ) {

	if ( typeof ElementProto.matches !== 'function' ) {

		ElementProto.matches = ElementProto.msMatchesSelector || ElementProto.mozMatchesSelector || ElementProto.webkitMatchesSelector || function matches( selector ) {

			var element = this,
				elements = ( element.document || element.ownerDocument ).querySelectorAll( selector ),
				index = 0;

				while ( elements[index] && elements[index] !== element ) {
					++index;
				}

				return Boolean( elements[index] );
		};

	}

	if ( typeof ElementProto.closest !== 'function' ) {

		ElementProto.closest = function closest( selector ) {

			var element = this;

				while ( element && element.nodeType === 1 ) {

					if ( element.matches( selector ) ) return element;

					element = element.parentNode;

				}

				return null;

		};

	}

})( window.Element.prototype );