Overlay

The first child determines natural size. Other children are decorations: they receive that established canvas and use Group-style pos and anchor placement. They contribute ink and overflow without enlarging the allocation. Source order is paint order; clip hides outside ink. Unlike Group, Overlay can hug its base. Decorations with pos default to anchor="center"; those without pos default to anchor="start" at the base's local origin. Set an explicit anchor to override.

Property	Default	Meaning
clip	false	Clip every layer to the base child's frame

See Positioning for pos, anchor, and the distinction between placement and content alignment.