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Webflow fix guide

Invalid Language Attribute on Webflow

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.

Webflow fix path

How to fix this on Webflow

Use project settings or navigator structure.

1Edit the page or project setting.
2Adjust the template or component output.
3Publish and inspect the final HTML.

After you fix it

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

Same fix, other platforms

Fix invalid language attribute on a different CMS

Other fixes

More Webflow fixes

Parents

Related guides

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