Success Criterion 1.4.10 "Reflow" is a Level AA requirement under the "perceivable" principle of WCAG 2.2. EN 301 549 clause 9.1.4.10 maps this criterion for procurement conformance.
Correct: at a 320 CSS-pixel width the page reflows vertically with no horizontal scrolling. Incorrect: a two-column layout that forces sideways scrolling, or data tables with no overflow handling. Test at a real 320px viewport, not just device emulation — sticky headers and wide tables are the usual offenders.
Engine coverage: partially automated (audit tier 2) — automated findings flag candidates; a clean VPAT claim still needs the documented manual check.
Last reviewed 2026-11-02 — generated from the engine’s WCAG criterion registry.
Reading up on WCAG 1.4.10? The engine verifies this surface from the perimeter — live on sovereign EU/UK partitions.