Closest, but with an extra argument to specify the ancestor to look up until

closest.js

closest = (function (Object, error) {
	return function (targetElement, selectors, untilElement) {
		let document = Object(Object(targetElement).ownerDocument)
		let rootElement = Object(document.documentElement)
		let Element = Object(document.defaultView).Element
		untilElement = untilElement || rootElement
		if (typeof Element === 'function' && targetElement instanceof Element && untilElement instanceof Element) {
			while (untilElement.contains(targetElement)) {
				if (targetElement.matches(selectors)) {
					return targetElement
				}
				targetElement = targetElement.parentElement
			}
			return null
		} else {
			throw new TypeError('Illegal invocation')
		}
	}
})(Object)