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XML User Interface Language (XUL) is an interface markup language developed by Mozilla that enables developers to design applications that can run in both online and offline modes. XUL was introduced by Netscape in 1997 as part of what eventually became the Mozilla codebase.
XUL is based on the core existing web standards - CSS, DOM and JavaScript. XUL relies on Gecko implementations, and, hence, it is not interoperable with non-Gecko standards. XUL does not have any formal specification. Widgets running on the Mozilla platform can be developed using XUL and ported across different platforms. Components of XUL documents include:
XUL files contain both XML and HTML elements in addition to XUL elements defined using the XUL namespace. A MIME type text/xul can be associated with XUL documents. An XUL interface defines a mechanism for programming a set of disconnected widgets. Simple scripting can be used like JavaScript, or complex C++ code can be used to define widget behavior.
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