A panel is basically a content and a title that is supposed to be ripped apart. It is used for exemple in accordion and tabs.
A panel has no reason to be outside of a panel container (it will show an injection error even), this is a sub-component of other components
The main slot is the content of the panel. A title slot can be provided too.
If no title slot is provided, these two properties are used:
title: stringicon: stringIf not specified, the container provides a default icon ('dropdown'foraccordionand''fortabs)