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+# html-has-lang
+
+<html> elements must have the lang prop.
+
+#### References
+1. [axe-core, html-has-lang](https://dequeuniversity.com/rules/axe/3.2/html-has-lang)
+1. [axe-core, html-lang-valid](https://dequeuniversity.com/rules/axe/3.2/html-lang-valid)
+
+## Rule details
+
+This rule takes no arguments.
+
+### Succeed
+```jsx
+<html lang="en">
+<html lang="en-US">
+<html lang={language}>
+```
+
+### Fail
+
+```jsx
+<html>
+```