What level is WCAG 1.4.10?

Level AA. It sits under guideline 1.4 Distinguishable of the Perceivable principle.

What are common ways pages fail WCAG 1.4.10?

Desktop layout forces horizontal scroll on mobile. Sticky headers consume more than 25% of small viewports.

How do I fix WCAG 1.4.10 issues?

Build mobile-first responsive layouts. Allow data tables to scroll horizontally inside their container, not the page.

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