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lang.md

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Pattern: Invalid language code

Issue: -

Description

The lang attribute on HTML elements must use valid IETF BCP 47 language tags. Invalid language codes prevent screen readers from using the correct pronunciation rules.

Examples

Example of incorrect code:

<html lang="english">
  <body>Hello</body>
</html>

<html lang="123">
  <body>Content</body>
</html>

Example of correct code:

<html lang="en">
  <body>Hello</body>
</html>

<html lang="en-US">
  <body>Content</body>
</html>