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The extra cue can be shape, pattern, position, line type, text label or icon; the sources do not set a numeric threshold for how different the extra cue must be. XAG 103 also scopes the rule: it applies to content critical to gameplay or narrative.\n\nCurator qualifications: The rule is verified in three independent primary documents. No numeric threshold for the extra cue, as stated.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://www.w3.org/WAI/WCAG22/Understanding/use-of-color.html","note":"SC 1.4.1; Color; principles"},{"url":"https://learn.microsoft.com/en-us/gaming/accessibility/xbox-accessibility-guidelines/103","note":"SC 1.4.1; Color; principles"},{"url":"https://web.archive.org/web/20210803155953id_/https://jfly.uni-koeln.de/color/","note":"SC 1.4.1; Color; principles"},{"url":"https://www.colourblindawareness.org/wp-content/uploads/2016/07/BBC-Trust-finds-in-favour-of-colour-blind-viewers-contact-details-amended.pdf","note":"SC 1.4.1; Color; principles"}]},"categories":["T17","T18"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://www.w3.org/WAI/WCAG22/Understanding/use-of-color.html","claim":"Three independent primary documents state the same rule: WCAG 2.2 SC 1.4.1 (colour is not the only visual means), Xbox Accessibility Guideline 103 ('colour alone should never be used'), and Okabe and Ito's redundant-coding principle. 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