RGAA : les ratios de contraste et règles de couleur exigés par le référentiel

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Le RGAA impose un rapport de contraste d'au moins 4,5:1 pour le texte courant et de 3:1 pour les grands textes, les composants d'interface et les éléments graphiques porteurs d'information. Il interdit également de transmettre une information par la couleur seule. Ces exigences forment la thématique 3 du référentiel, qui correspond aux critères WCAG 1.4.3 et 1.4.11, tous deux de niveau AA. Le seuil applicable au texte dépend de sa taille affichée et de sa graisse, et les textes en image sont soumis aux mêmes seuils. Des cas particuliers, comme les composants désactivés ou les logos, sont exemptés, et la correction consiste souvent à doubler la couleur par un texte, un pictogramme ou un motif.

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