windowtype, xmlns:rdf, xmlns:web, titlepreface, onload, onunload, xmlns, titlemodifier, xmlns:html, title, onclose, titlemenuseparator, contenttitlesetting, y, x, screenY, screenX
The window is an XUL document's basic root element. The contents of a XUL document, including the script elements, commands, keys, and broadcasters, appear as children of the window. Overlays, the XML and stylesheet-processing instructions, and the DOCTYPE declaration appear before and outside a document's root element. The window should have a unique ID and use minimally, the XUL namespace to identify markup elements as XUL: xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul".