URL: /rules/a11y/html-lang-valid
---
title: "HTML Lang Valid"
description: "Checks that the html lang attribute has a valid language code"
---
Checks that the html lang attribute has a valid language code
| | |
|---|---|
| **Rule ID** | `a11y/html-lang-valid` |
| **Category** | [Accessibility](/rules/a11y) |
| **Scope** | Per-page |
| **Severity** | error |
| **Weight** | 7/10 |
## Solution
The lang attribute on `` should be a valid BCP 47 language tag. Use two-letter ISO 639-1 codes like 'en' for English, 'es' for Spanish, 'fr' for French. You can add region subtags like 'en-US' or 'en-GB'. This helps screen readers use correct pronunciation.
## Enable / Disable
### Disable this rule
```toml squirrel.toml
[rules]
disable = ["a11y/html-lang-valid"]
```
### Disable all Accessibility rules
```toml squirrel.toml
[rules]
disable = ["a11y/*"]
```
### Enable only this rule
```toml squirrel.toml
[rules]
enable = ["a11y/html-lang-valid"]
disable = ["*"]
```