Overview
<x-row> is a horizontal flex container (default align-items: center). <x-col> is vertical (default align-items: stretch).
Both observe spacing, gap, align, wrap, inline, fill, and padding shorthands. There is no <x-stack> — use these elements or the stack() directive.
x-row + x-col live demo
A header row, then a wrapping row of boxes inside a column — all via custom elements.