The main collapsible component.
:id - Required unique identifier for the collapsible.:open - Whether the collapsible is initially open. Defaults to false.:on-open - Handler for collapsible open event.:on-close - Handler for collapsible close event.:class - Additional CSS classes.:on-open - Fired when the collapsible opens.:on-close - Fired when the collapsible closes."open" - Opens the collapsible."close" - Closes the collapsible."toggle" - Toggles the collapsible.