What changes?

Stack, wrap, and simplify layout when its content no longer fits. WCAG AA reflow requires ordinary vertically scrolling content to work at a width equivalent to 320 CSS pixels without two-dimensional scrolling.

Use it in your work

Turn a side-by-side product section into a readable vertical sequence.

A common mistake

Scaling a desktop screenshot down until the text is tiny.

Context matters

Some content such as maps and data tables has reflow exceptions; its surrounding controls still need to work.