检测500大网站色差合规性，超四成文本颜色不达标。
Colour Contrast on the Web: A WCAG 2.1 Level AA Compliance Audit of Common Crawl's Top 500 Domains
- 基于静态CSS分析网页色彩组合，不访问真实站点
- 40.9%的配色对不满足正常文字对比度要求
- 20.4%网站完全合规，适合关注网页可访问性的开发者
我们对Common Crawl CC-MAIN-2026-08 2026年2月数据集中排名前500的注册域名进行了大规模自动化审计，评估其在WCAG 2.1/2.2 Level AA标准下的色彩对比度合规性。所有页面内容均来自Common Crawl的开放WARC存档，确保可复现且不增加目标服务器负载。对240个主页的静态CSS分析发现，共存在4,327组独特的前景/背景色彩组合，其中1,771组（40.9%）未达到正常文本4.5:1的对比度阈值。各站点平均通过率为62.7%，20.4%的站点在所有检测到的色彩组合中实现完全合规。结果表明，色彩对比度仍是主流网站普遍存在的可访问性障碍，不同域名类别间差异显著。
原文摘要 · Abstract (English)
We present a large-scale automated audit of WCAG 2.1/2.2 Level AA colour contrast compliance across the 500 most frequently crawled registered domains in Common Crawl's CC-MAIN-2026-08 February 2026 crawl archive. Rather than conducting a live crawl, all page content was sourced from Common Crawl's open WARC archives, ensuring reproducibility and eliminating any load on target web servers. Our static CSS analysis of 240 homepages identified 4,327 unique foreground/background colour pairings, of which 1,771 (40.9%) failed to meet the 4.5:1 contrast ratio threshold for normal text. The median per-site pass rate was 62.7%, with 20.4% of sites achieving full compliance across all detected colour pairings. These findings suggest that colour contrast remains a widespread accessibility barrier on the most prominent websites, with significant variation across domain categories.
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