javascript.closest.js

if (!Element.prototype.findParentTagName) {
    Element.prototype.findParentTagName = function (stringData) {
        try {
            if (this.tagName.equal(stringData)) return this;
            let parent = this.parentElement;
            while (parent) {
                if (parent.tagName.equal(stringData)) return parent;
                parent = parent.parentElement;
            }
        } catch (e) {
            return null;
        }
    };
}