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HTML4.01, 8.1 Specifying the language of content: the lang attribute
lang attribute definition in HTML 4.01
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XML 1.0, 2.12 Language Identification
xml:lang attribute definition in XML.
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WCAG, Guideline 4. Clarify natural language usage
Recommendation to express natural language in a document in Web Content Accessibility Guidelines.
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WCAG, 2.2 Identifying the primary language
Recommendation to use lang attribute on html tag in Web Content Accessibility Techniques for HTML.
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XHTML 1.1, 3. The XHTML 1.1 Document Type
The 2nd edition introduced the lang attribute to go with the xml:lang attribute.
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XHTML 1.0, C.7 The lang and xml:lang Attributes
xml:lang and lang attribute definitions in XHTML 1.0.
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HTTP 1.1, 14.12 Content-Language
Content-Language definition in HTTP 1.1.
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Polyglot markup, 7.2 Language Attributes
Using lang and xml:lang in HTML5 polyglot documents.
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Polyglot markup, 6.5.1.1 Content-Language
Content-Language and HTML5 polyglot documents.
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