Fill (leaf)

This is used for spacing other objects. Fill uses the background color, and it is essentially a shorthand for (Glue 0 + Inf).

Shape
Both dimensions have zero preferred and minimum size and are infinitely stretchable. Thus, the non-principal direction takes on the same shape as its parent.
Notes
Must be a child of a horizontal or vertical split (HBox, HVTile, VBox, or VTile).
See Also
Glue