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https://www.w3.org/WAI/training/accessible
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https://www.imsglobal.org/activity/accessibility
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https://www.w3.org/TR/IMPLEMENTING-ATAG20/
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https://www.w3.org/TR/WCAG20/
5. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering;A Dattolo,2017