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XML User Interface Language (XUL)

This is the home page for Mozilla XUL documentation.

The Joy Of XUL gives an executive overview of XUL and explains why the Mozilla platform is built with it.
XUL 1.0 specification.
XUL examples and tutorials can be found at XUL Planet.
XRE Project (XUL Runtime Environment)
XUL Tutorial (XUL Planet) Easily-to-follow tutorial for creating cross-platform application with XUL, updated for Mozilla 1.4.
XUL Programmer's Reference Manual
More documentation...