A User interface stylesheet language is a

stylesheet language A style sheet language, or style language, is a computer language that expresses the presentation of structured documents. One attractive feature of structured documents is that the content can be reused in many contexts and presented in various w ...

which is meant to be applied to graphical computer user interfaces. They primarily act as subsidiary languages to style UI elements which are either programmed or marked-up (as in XML-based markup languages).

Examples

* Cascading Style Sheets as used in

Mozilla Mozilla (stylized as moz://a) is a free software community founded in 1998 by members of Netscape. The Mozilla community uses, develops, spreads and supports Mozilla products, thereby promoting exclusively free software and open standards, w ...

XUL XUL ( ), which stands for XML User Interface Language, is a user interface markup language developed by Mozilla. XUL is an XML dialect for writing graphical user interfaces, enabling developers to write user interface elements in a manner sim ...

user interface * Qt Style Sheets as used in KDE4
Robert Staudinger's
CSS theming for GTK+''Ars Technica article''
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References

Stylesheet languages {{Tech-stub