<description value="This is the first page"/>
<button label="This is the second page"/>
<description value="This is the third page"/>
<button label="This is also the third page"/>
Returns the index of the currently selected item. You may select an item by assigning its index to this property. By assigning -1 to this property, all items will be deselected. Returns -1 if no items are selected
Do not hide panels; the deck element only understands visible panels.
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