Issue 6104 - Minified code in help center repository

src/js/vendor/element-closest.js

+/*! @source https://github.com/jonathantneal/closest/blob/master/element-closest.js */
+
+(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);