Stylesheet
Declares a style sheet used by the binding. Using this element is preferred over using an XML processing instruction.
Attributes:
Attributes inherited from XUL Element
The style class of the xbl:stylesheet. Multiple classes may be specified by separating them with spaces.
A unique identifier so that you can identify the xbl:stylesheet with. You can use this as a parameter to getElementById and other DOM functions and to reference the element in style sheets.
The URL of the style sheet to apply to the binding content.