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// Node.prototype.contains
(function() {

	function contains(node) {
		if (!(0 in arguments)) {
			throw new TypeError('1 argument is required');
		}

		do {
			if (this === node) {
				return true;
			}
		// eslint-disable-next-line no-cond-assign
		} while (node = node && node.parentNode);

		return false;
	}

	// IE
	if ('HTMLElement' in self && 'contains' in HTMLElement.prototype) {
		try {
			delete HTMLElement.prototype.contains;
		// eslint-disable-next-line no-empty
		} catch (e) {}
	}

	if ('Node' in self) {
		Node.prototype.contains = contains;
	} else {
		document.contains = Element.prototype.contains = contains;
	}

}());