~canonical-sysadmins/wordpress/5.0.2

// 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);