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codeql-action/node_modules/eslint-plugin-jsx-a11y/docs/rules/lang.md
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| # jsx-a11y/lang | |
| <!-- end auto-generated rule header --> | |
| The `lang` prop on the `<html>` element must be a valid IETF's BCP 47 language tag. | |
| ## Rule details | |
| This rule takes no arguments. | |
| ### Succeed | |
| ```jsx | |
| <html lang="en"> | |
| <html lang="en-US"> | |
| ``` | |
| ### Fail | |
| ```jsx | |
| <html> | |
| <html lang="foo"> | |
| ``` | |
| ## Accessibility guidelines | |
| - [WCAG 3.1.1](https://www.w3.org/WAI/WCAG21/Understanding/language-of-page) | |
| ### Resources | |
| - [axe-core, valid-lang](https://dequeuniversity.com/rules/axe/3.2/valid-lang) | |
| - [Language tags in HTML and XML](https://www.w3.org/International/articles/language-tags/) | |
| - [IANA Language Subtag Registry](https://www.iana.org/assignments/language-subtag-registry/language-subtag-registry) |