Checks / Titles, headings and schema
No language declared
Without <html lang>, crawlers guess the language, and answers in the wrong language are less likely to cite you.
lang_missing · Titles, headings and schema · Notice
What to change
Add the page language to the html tag, for example <html lang="en">.
Example
HTML to put in the page:
<html lang="en">How common it is
We have not measured how common this is on a sample of sites. Counts appear here when a study covers it.
About this check
| Check ID | lang_missing |
|---|---|
| Report section | Titles, headings and schema |
| Severity | Notice |
| How it is decided | Measured: read directly from the page or the server's response. |
| Added | Version 3, 19 October 2026 |
| Status | Measured in every report |
| Report gives the code | No, the fix is described in words |
Related checks
- Declared language differs from the text
- Missing title
- Missing meta description
- Organization lists no profile outside your own site
- FAQ markup lists questions the page does not show
- Form field without a name
See whether it applies to your site
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