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Sim Daltonism - From the perspective of a color blind person, some colors are impossible to distinguish.
Total Validator - Total Validator can check your website to help ensure that it is accessible, uses valid HTML and CSS, has no broken links, and is free from spelling mistakes.
Colour Blindness Simulator - Use our Colour Blindness Simulator to reveal how your images may appear to users with a variety of...
W3C Markup Validation Service - Validates HTML markup of web pages, one at a time.
Colorblind Web Page Filter - Enter a URL, and this tool will render it as someone with color blindness will see it.
Rocket Validator - Site-wide Accessibility and HTML validation made easy. With a single click, Rocket Validator will check thousands of web pages on your site for Accessibility and HTML conformance, producing a detailed, actionable report on seconds.