Registry · Perceivable

1.4.3 — Contrast (Minimum)

Level AA Perceivable

Operational summary

IF non-exempt text is ordinary sized, require at least 4.5:1; IF it is large-scale, require at least 3:1. Large-scale includes 18pt regular or 14pt bold, with equivalent-size language qualifications. Review incidental/inactive/logotype exceptions. Never round a failing ratio upward.

This is an original implementation summary, not replacement normative text. The sources below supply the precise requirement, its definitions and its qualifications.

Primary sources

• Normative text — W3C WCAG 2.2 Recommendation
• Understanding 1.4.3 — explanatory guidance

Registry record

Applicability and assessment start unset by design — no product has been evaluated. Instantiate the entry for an actual product, assign an owner and retain evidence.

{
  "criterion_id": "1.4.3",
  "level": "AA",
  "name": "Contrast (Minimum)",
  "rule_definition": "../03-WCAG22-AA-REGISTRY.md#sc-1-4-3",
  "normative_source": "https://www.w3.org/TR/WCAG22/#contrast-minimum",
  "understanding_source": "https://www.w3.org/WAI/WCAG22/Understanding/contrast-minimum.html",
  "applicability_status": "NOT_EVALUATED",
  "assessment_status": "NOT_TESTED",
  "owner": null,
  "test_instance_ids": [],
  "exception_evidence_ids": []
}

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