}
    }

    public static void addBefore(Node sibling, Closure cl) {
        DomBuilder builder = new DomBuilder(sibling.ownerDocument, null)
        cl.delegate = builder
        cl.call()
        def parent = sibling.parentNode
        builder.elements.each { element ->
            parent.insertBefore(element, sibling)
        }
    }

    public static void addBefore(Element sibling, Node n) {

     */
    public void addFirst(final E element) {
        header.next.addBefore(element);
    }

    /**
     * Adds an element at the end.
     *
     * @param element the object to be added
     */
    public void addLast(final E element) {
        header.addBefore(element);
    }

    /**
     * Inserts an object at the specified position.
     *

ck-1x{line-height:inherit}.fa-stack-2x{font-size:2em}.fa-inverse{color:#fff}.fa-500px:before{content:"\f26e"}.fa-accessible-icon:before{content:"\f368"}.fa-accusoft:before{content:"\f369"}.fa-acquisitions-incorporated:before{content:"\f6af"}.fa-ad:before{content:"\f641"}.fa-address-book:before{content:"\f2b9"}.fa-address-card:before{content:"\f2bb"}.fa-adjust:before{content:"\f042"}.fa-adn:before{content:"\f170"}.fa-adobe:before{content:"\f778"}.fa-adversal:before{content:"\f36a"}.fa-affiliateth...

ck-1x{line-height:inherit}.fa-stack-2x{font-size:2em}.fa-inverse{color:#fff}.fa-500px:before{content:"\f26e"}.fa-accessible-icon:before{content:"\f368"}.fa-accusoft:before{content:"\f369"}.fa-acquisitions-incorporated:before{content:"\f6af"}.fa-ad:before{content:"\f641"}.fa-address-book:before{content:"\f2b9"}.fa-address-card:before{content:"\f2bb"}.fa-adjust:before{content:"\f042"}.fa-adn:before{content:"\f170"}.fa-adobe:before{content:"\f778"}.fa-adversal:before{content:"\f36a"}.fa-affiliateth...