Unverified50% confidenceFactExact time
WCAG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
1
Sources
50%
Confidence
Long-term
Relevance
7/13/2026
First Seen
Sources
92%美国城市官网无障碍不达标：ADA合规现状与改进指南
hackernewshackernews7/9/2026
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