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WCAG 2.0 is based on 4 core accessibility principles.Each principle determines a number of accessibility guidelines as basic objectives that need to be met by web pages.If the content cannot be parsed into a data structure, then different user agents may present it differently or be completely unable to parse it.Some user agents use "repair techniques" to render poorly coded content.

When a visitor browses to a web page, they have to be able to perceive its content and functionality through their senses.Each guideline can be evaluated through a number of accessibility success criteria which test page conformance.Each individual success criterion can be met by applying a number of accessibility techniques.To make this distinction clear, we'll consider both WCAG conformance of core Captcha features and the necessary WCAG conformance of Captcha-related form elements.Web Content Accessibility Guidelines (WCAG) 2.0 covers a wide range of recommendations for making Web content more accessible.

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