Mozilla XUL Element and Script Reference

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Overlay

Defined in its own XUL file, its content is overlaid on top of another element with the corresponding id.

Attributes:

class

The style class of the overlay. Multiple classes may be specified by separating them with spaces.

id

A unique identifier so that you can identify the overlay with. You can use this as a parameter to getElementById and other DOM functions and to reference the element in style sheets.