Accessibility validators
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Web Accessibility Initiative (WAI) The WAI guidelines are widely regarded as the international standard for Web accessibility, and the WAI develops support materials to help understand and implement Web accessibility. The WAI website contains many resources for developing accessible pages, including guidelines and techniques, information on managing accessibility, and evaluation information.
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Web Accessibility Network for Australian Universities is a group of staff and students from Australian universities who care about web accessibility. They have an excellent resource on their website for making webpages accessible, which includes design guidelines, techniques, and evaluation tools.