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Bot Detect includes short text alternatives for Captcha images and the icons controlling Captcha sound playback and reloading, and allows you to customize them to follow this WCAG technique according to the requirements (language, reading level, purpose) of your Captcha-protected form.Each developer will write appropriate Captcha challenge instructions as part of adding Captcha protection to the form.Each principle determines a number of accessibility guidelines as basic objectives that need to be met by web pages.Each guideline can be evaluated through a number of accessibility success criteria which test page conformance.

To make WCAG-conformant Captcha implementation as easy as possible, we'll examine WCAG implications for Captcha validation in detail.To make a web form accessible to perceptual needs of disabled visitors, important page content should be available in a format that can be used or transformed by assistive technology.The form also needs to preserve necessary information, structure and functionality when adapted to the visitor's particular needs (if the form layout is changed because the visitor uses a very high level of zoom, when CSS layout is not used at all, when the visitor cannot perceive color, ...) Since Captcha challenges are often designed to distinguish between human visitors and automated bots by testing for unique properties of human senses (most commonly, vision), it is very important to consider Captcha designs that won't prove unfairly hard or impossible for individuals with sensory disabilities of any kind.Following these guidelines will also often make your Web content more usable to users in general.WCAG 2.0 is based on 4 core accessibility principles.If your Captcha implementation or form does use time-based media for some reason, you should of course consider it carefully to achieve WCAG conformance.

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