This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Avoid using it and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
This element should appear directly inside a
rule element and is used to define conditions for the rule. Within the conditions can be placed
triple elements. These may have attributes whose value is a variable name beginning with a question mark (
?). When evaluating the rule for a particular RDF resource, the variables are replaced with values from the resource. If all variables can be replaced, the rule matched.
This element is used with Firefox 2/Mozilla 1.8 and earlier instead of the
More information is available in the XUL tutorial.
Inherited from XUL element