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- Type: string
The panel type. Should be one of the following:
- Specify this for a panel that provides a tree for an autocomplete element.
- Specify this for a panel that provides a richlistbox for an autocomplete element.
- Specify this for a panel that provides an arrow pointing at its anchor.
- Specify this for a panel that's being used as a drag image for a drag and drop operation.
For example, the site identity panel that appears when you click on the favicon in the URL bar in Firefox is an arrow panel: