The Widgets draft <http://www.w3.org/TR/widgets/> seems to be meant for offline widgets (ala Google Desktop). After inspection it does not seem that it could even be 100% used because it defines a window object to be accessible to the widget representing the widget's window (which conflicts with the browser window object representing the browser window).
-- - Stephen Paul Weber, <http://webos.singpolyma.net/Widgets>
