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/**
 * Get all of an element's parent elements up the DOM tree
 * @param  {Node}   elem     The element
 * @param  {String} selector Selector to match against [optional]
 * @return {Array}           The parent elements
 */
var getParents = function ( elem, selector ) {

	// Element.matches() polyfill
	if (!Element.prototype.matches) {
		Element.prototype.matches =
			Element.prototype.matchesSelector ||
			Element.prototype.mozMatchesSelector ||
			Element.prototype.msMatchesSelector ||
			Element.prototype.oMatchesSelector ||
			Element.prototype.webkitMatchesSelector ||
			function(s) {
				var matches = (this.document || this.ownerDocument).querySelectorAll(s),
					i = matches.length;
				while (--i >= 0 && matches.item(i) !== this) {}
				return i > -1;
			};
	}

	// Setup parents array
	var parents = [];

	// Get matching parent elements
	for ( ; elem && elem !== document; elem = elem.parentNode ) {

		// Add matching parents to array
		if ( selector ) {
			if ( elem.matches( selector ) ) {
				parents.push( elem );
			}
		} else {
			parents.push( elem );
		}

	}

	return parents;

};

// https://gomakethings.com/climbing-up-and-down-the-dom-tree-with-vanilla-javascript/