HTML/XML Application.

[joelbryan]

Does GNOME or KDE have this functionality? to run an HTML directly?
under Windows XP, just rename the HTML file to HTA and it would run
the file just like a normal application.
I've heard Mozilla have it's XUL functionality that does the same, but
I could not make it work?
Microsoft Longhorn's concept videos run XML file directly.
http://msdn.microsoft.com/Longhorn/productinfo/conceptvid/default.aspx
Will features like this be on the priority list?

-- 
Music = Apple iPod + Rhythmbox & iTunes
Browser = Mozilla Firefox & Epiphany
Desktop = Gnome, Mac OSX, Longhorn 4074
Distro = Fedora Core
Language = PHP, MySQL, Python, HTML
Graphics = Gimp 2.0, gThumb
Editors = FrontPage 2003, vi, gedit
Codecs = FLAC, Ogg Vorbis, Apple Lossless