mmenu-js/src/_polyfills/dom.before.js

The best javascript plugin for app look-alike on- and off-canvas menus with sliding submenus for your website and webapp.

// Source: https://github.com/jserz/js_piece/blob/master/DOM/ChildNode/before()/before().md
(function(arr) {
    arr.forEach(function(item) {
        if (item.hasOwnProperty('before')) {
            return;
        }
        Object.defineProperty(item, 'before', {
            configurable: true,
            enumerable: true,
            writable: true,
            value: function before() {
                var argArr = Array.prototype.slice.call(arguments),
                    docFrag = document.createDocumentFragment();

                argArr.forEach(function(argItem) {
                    var isNode = argItem instanceof Node;
                    docFrag.appendChild(
                        isNode
                            ? argItem
                            : document.createTextNode(String(argItem))
                    );
                });

                this.parentNode.insertBefore(docFrag, this);
            }
        });
    });
})([Element.prototype, CharacterData.prototype, DocumentType.prototype]);