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Language Attribute Checker

v1.1.0

Check lang attributes across HTML elements for i18n correctness.

Checks HTML documents for correct lang attribute usage — verifies the page-level lang on the html element, detects language switches on inline elements, and validates BCP 47 language tag syntax.

How to use
  • →Paste your HTML or enter a URL to run the language attribute audit.
  • →Verify the html element has a lang attribute with a valid BCP 47 tag (e.g. "en", "de", "zh-Hans").
  • →Flag any sections in a different language that are missing a lang attribute override on their container.
  • →Export the findings as a WCAG 2.1 success criterion 3.1.1 and 3.1.2 checklist item.