1.4 Distinguishable · Perceivable
WCAG 1.4.10 Reflow
Level AA
Content must reflow into a single column at 320 CSS pixels wide (mobile portrait) without horizontal scrolling, except for content where 2D layout is essential (data tables, maps, code).
Common failures
- Desktop layout forces horizontal scroll on mobile.
- Sticky headers consume more than 25% of small viewports.
How to fix
- Build mobile-first responsive layouts.
- Allow data tables to scroll horizontally inside their container, not the page.
Related criteria
- WCAG 1.3.4 Orientation Level AA
- WCAG 1.4.4 Resize Text Level AA