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Lang and xml:lang Must Match

Best practices guide for Lang and xml:lang Must Match (HT-023). Priority: Medium. Live check available.
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HTML Element Must Have a Lang Attribute

Best practices guide for HTML Element Must Have a Lang Attribute (HT-017). Priority: High. Live check…
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HTML Element Must Have Valid Lang Attribute Value

Best practices guide for HTML Element Must Have Valid Lang Attribute Value (HT-022). Priority: High. Live…
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