WCAG/3-understandable/3.1.1-language-of-page.md

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3.1.1 Language of Page

• Level: A
• Guideline: 3.1 Readable
• Principle: 3 Understandable

What it is

The default human language of each web page can be programmatically determined.

How to test

• Check: The default human language of each web page can be programmatically determined.
• Use the sufficient techniques below as acceptable methods when applicable.

Sufficient techniques (W3C)

• H57: Using the language attribute on the HTML element
• PDF16: Setting the default language using the /Lang entry in the document catalog of a PDF document
• PDF19: Specifying the language for a passage or phrase with the Lang entry in PDF documents

Advisory techniques (W3C)

• SVR5: Specifying the default language in the HTTP header

Resources

• WCAG 2.2 SC: https://www.w3.org/TR/WCAG22/#language-of-page
• Understanding: https://www.w3.org/WAI/WCAG22/Understanding/language-of-page.html
• Quick reference: https://www.w3.org/WAI/WCAG22/quickref/?versions=2.2#language-of-page

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