Principle 1 Perceivable · Guideline 1.4: Distinguishable
1.4.3 Contrast (Minimum)
Text needs a contrast ratio of at least 4.5:1, large text 3:1.
What this means in practice
Large means 24 px or above, or 18.7 px when bold. Logos and purely decorative text are exempt. The single most common failure – and one of the few that can be measured exactly.
What Wave Access contributes
Der Kontrast-Assistent misst jede Fundstelle im Browser, berechnet die kleinste nötige Korrektur bei erhaltenem Farbton und liefert sie nach Freigabe als CSS aus.
Normative wording
The binding text lives at the W3C. What you read here is our own faithful rendering – not a quotation.