Y.Node.ATTRS.outerHTML = {
        getter: function() {
            var d = Y.Node.create('<div>'), html;
            d.append(this.cloneNode(true));
            html = d.get('innerHTML');
            delete d;
            return html;
        },
        setter: function(html) {
            var node = Y.Node.create(html);
            this.replace(node);
            return node;
        }
    };

    var o = Y.one('#foo').get('outerHTML');
    console.log(Y.one('#bar').set('outerHTML', o));