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WordPress fix guide

Invalid Language Attribute on WordPress

The lang attribute value does not match a valid BCP 47 language tag, or appears inconsistent with the detected page language.

Issue ID: TECH-LANG-MISMATCH-001Severity: minorEffort: S

Why this matters

The lang attribute value does not match a valid BCP 47 language tag, or appears inconsistent with the detected page language. This affects crawlability, rendering, and whether the site can be interpreted correctly by search engines.

WordPress fix path

How to fix this on WordPress

These are usually theme-level fixes.

  1. 1Check your active theme or page builder output.
  2. 2Update the relevant setting or theme template.
  3. 3Clear caches and confirm the rendered HTML changed.

After you fix it

  • Inspect <html lang="..."> and confirm it matches the page language

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