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## WCAG 2.1
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- [WCAG 2.1](/Home/Requirements/Universal design/WCAG 2.1)
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## Donald Norman's principles
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- [Donald Norman's principles](Home/Requirements/Universal design/Donald Norman's principles)
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## Jeff Johnson's design principles
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- [Jeff Johnsons's Design Principles](Home/Requirements/Universal design/Jeff Johnson's design principles) |