Currently, if I create a new Element and serialize it, I get it's siblings too.
var documentElement = new Element('html');
var head = new Element('head');
var body = new Element('body');
documentElement.appendChild(head);
documentElement.appendChild(body);
new HTMLSerializer.serialize(head); // => <head><head><body></body>
Currently, if I create a new Element and serialize it, I get it's siblings too.