<<.from-version "5.3.0">> The <<.wlink SlotWidget>> widget is used within transcluded content to mark "slots" that the transcluding widget can fill with the <<.wlink FillWidget>> widget.
See the <<.wlink TranscludeWidget>> widget for details.
! Attributes
The content of the <<.wlink SlotWidget>> widget is used as a fallback for the slot content if the corresponding <<.wlink FillWidget>> widget is not found.