Checks the current page for color contrast compliance with Web Content Accessibility Guidelines (WCAG) level AA, as documented on this page:
https://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-contrast.html
Also checks for images that don't have alt text.
谷歌浏览器、其他Chromium内核的浏览器
为打击盗链困扰,本站已启用人机验证
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