Success Criterion 1.4.1 "Use of Color" is a Level A requirement under the "perceivable" principle of WCAG 2.2. EN 301 549 clause 9.1.4.1 maps this criterion for procurement conformance.
Correct: an invalid field shows a red border AND an icon with text ("Email is required"). Incorrect: colour as the only signal — a red-bordered field with no message, or a chart whose series differ only by hue. "It is also in the legend" does not save a chart where two series differ only by colour — add pattern, shape, or direct labels.
Engine coverage: partially automated (audit tier 1/2) — 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 1.4.1? The engine verifies this surface from the perimeter — live on sovereign EU/UK partitions.