CSS BEHAVIOR

The Behavior property specifies one or more space separated URLs indicating script(s) to attach to a CSS selector. Behaviors allow the default functionality of a given element to be extended. Using simple CSS syntax that allows script to be separated from style and content, CSS behaviors offer a fairly elegant and efficient way to re-use script code. This is an IE propietary property

Example
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blockquote { behavior: url(hilight.htc) url(#behaveBinObject) }
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<blockquote style="behavior: url(hilight.htc) url(#behaveBinObject)">Some text</blockquote>

Possible Values

[Script URL]: Provides an absolute or relative URL reference to the Behavior.
[#Object ID]: The Behavior is a binary implementation. This syntax consists of a pound sign (“#”) followed by an OBJECT element ID within the document that instantiates the binary implementation.
[Default Behavior]: Quite a few default behaviors ship with Internet Explorer 5.0. This syntax allows each default behavior to be easily referenced.