Unverified50% confidenceFactExact time
A contrast ratio ≥4.5:1 originates from the AA level of WCAG 2.1 and is used to measure whether the brightness contrast between text and background is sufficient.
1
Sources
50%
Confidence
Long-term
Relevance
10/18/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedWCAG设有A、AA、AAA三个合规等级，AA级要求色彩对比度至少4.5:1、文本可缩放至200%不丢失功能，业界和法规普遍要求AA级65% similarUnverifiedWCAG Level AA covers approximately 50 success criteria, including image alternative text, color contrast no lower than 4.5:1, all functionality operable via keyboard, and form elements having explicit labels.59% similarUnverifiedReasonable Colours将无障碍访问（accessibility）作为核心设计原则，确保调色板中任意前景色与背景色的组合都能通过WCAG AA级对比度检验59% similar
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