G134 validating web pages
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is not intended to be used as a stand-alone document.
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When evaluating the accessibility of a web form which includes Captcha validation to only allow submissions from verified human visitors, checking WCAG conformance is a logical choice for most websites.
However, WCAG is also the most complex web accessibility standard, and requires careful consideration to meet.
To make WCAG-conformant Captcha implementation as easy as possible, we'll examine WCAG implications for Captcha validation in detail.
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Instead, it is expected that content authors will usually use How to Meet WCAG 2.0: A customizable quick reference to read the WCAG success criteria, and follow links from there to specific topics in Understanding WCAG 2.0 and to specific techniques.