Vertical stack layout — children flow top-to-bottom without individual y positions.
Like HTML block elements: only the stack origin uses position, children stack
automatically with wrap.
Summary
Functions
Bottom edge relative to stack origin top (position y is negative down from box top).
Measure total height of stacked children in points.
Render stacked children starting at absolute {x, y} on the document.
Functions
Bottom edge relative to stack origin top (position y is negative down from box top).
Measure total height of stacked children in points.
Render stacked children starting at absolute {x, y} on the document.