An XBL file contains bindings. Each of them describes the behavior of a XUL widget or XML element. For example, a binding might be attached to a scroll bar. The behavior describes the properties and methods of the scroll bar and describes the XUL elements defining the scroll bar.
element, which contains one or more
elements. Each
element declares one binding, which can be attached to any XUL element. It also may have an id
attribute. A binding is assigned to an element by setting the CSS property -moz-binding
to the URL of the bindings file.The XBL 1.0 specification is used in the mozilla XPFE platform, alongside with the XUL XML language, so XBL is available on all mozilla products: Firefox, Thunderbird, SeaMonkey, etc. However, it must be noted that Mozilla implements a variant of XBL 1.0 which does not quite match the specification.
A XBL 2.0 version of the specification is on the way. The objectives of this version are to address problems of the 1.0 version, and to generalize XBL usage in non-mozilla browsers.
While the body of this version of the specification was created by the Mozilla Foundation, outside W3C (as was the case for the XBL 1.0 version), the W3C Web Application Formats Working Group is now guiding this specification along the W3C Recommendation track.
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