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// element-closest | CC0-1.0 | github.com/jonathantneal/closest

(function (ElementProto) {
	if (typeof ElementProto.matches !== 'function') {
		ElementProto.matches = ElementProto.msMatchesSelector || ElementProto.mozMatchesSelector || ElementProto.webkitMatchesSelector || function matches(selector) {
			var element = this;
			var elements = (element.document || element.ownerDocument).querySelectorAll(selector);
			var 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);