This Note replaces a proposal for features in CSS that allow to bind “behaviors” to the elements of a document. A “behavior” is defined by a URL and typically points to an object (in a language such as XBL [XBL]) that defines its own appearance and user interaction. Such a binding allows, e.g. to replace an element by a complex user interface control. The features are no longer being developed.
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In 1999, the CSS working group worked on a Behavioral Extensions to CSS specification that proposed syntax for actual binding definitions. Since then, separate languages have been developed for this purpose (e.g. XBL [XBL]), and the CSS-specific way of defining bindings was dropped.
The proposed role of CSS then became only to attach the external object
defined in XBL to an element in a document, via a ‘
binding’ property that takes a URL as value.
Insufficient interest in XBL and the ‘
binding’ property made the CSS Working Group
decide to stop the development of the specification. (For the same reason,
the Web Applications Working Group decided to halt the development of
Note that for the specific case of documents in HTML [HTML5], the HTML
Working Group has developed an alternative solution. (See the