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AB [A11y] enhance text color contrast · Issue #170697 · flutter/flutter · GitHub
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[A11y] enhance text color contrast #170697

@chunhtai

Description

@chunhtai

Use case

WCAG publicshed a level AAA text color contrast that raise to 7:1.

The visual presentation of text and images of text has a contrast ratio of at least 7:1, except for the following:

Large Text
Large-scale text and images of large-scale text have a contrast ratio of at least 4.5:1;

Incidental
Text or images of text that are part of an inactive user interface component, that are pure decoration, that are not visible to anyone, or that are part of a picture that contains significant other visual content, have no contrast requirement.

Logotypes
Text that is part of a logo or brand name has no contrast requirement.

Proposal

Our current MinimumTextContrastGuideline targets 4.5:1 for normal text and 3:1 for large text. We should add a variant of this test that target 7:1 for normal text and 4.5:1 for large text

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P2Important issues not at the top of the work lista: accessibilityAccessibility, e.g. VoiceOver or TalkBack. (aka a11y)good first issueRelatively approachable for first-time contributorsteam-accessibilityOwned by Framework Accessibility team (i.e. responsible for accessibility code in flutter/flutter)triaged-accessibilityTriaged by Framework Accessibility team

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