Success Criterion 3.3.1 "Error Identification" is a Level A requirement under the "understandable" principle of WCAG 2.2. EN 301 549 clause 9.3.3.1 maps this criterion for procurement conformance.
Correct: the error is identified in text and tied to its field — "Email: enter an address like name@example.com". Incorrect: only a red border, or a summary banner that never says which fields failed. Colour alone never identifies an error — the message must name the field and the problem.
Engine coverage: manual-only in the current audit tiers — no automated run can certify it.
Last reviewed 2026-11-02 — generated from the engine’s WCAG criterion registry.
Reading up on WCAG 3.3.1? The engine verifies this surface from the perimeter — live on sovereign EU/UK partitions.