{# @description One entry of a megamenu, used inside megamenu. A button opens the panel that follows it, and the default slot is the panel's content. #}
{# @prop megamenu:text | required | description:"Id of the megamenu this item belongs to." #}
{# @prop key:text | required | description:"Name of this item, unique within the megamenu. The panel's id is the megamenu id, a hyphen and this key." #}
{# @prop text:text | description:"The button's label." #}
{# @prop class:text | description:"Extra classes added to the panel." #}
{# @slot