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Checks that all lang attributes on the page have valid values
Rule IDa11y/valid-lang
CategoryAccessibility
ScopePer-page
Severitywarning
Weight5/10

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Solution

All lang attributes should use valid BCP 47 language tags. This includes lang attributes on any element, not just <html>. Use lang to mark up content in a different language from the page default.

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Enable / Disable

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Disable this rule

squirrel.toml
[rules]
disable = ["a11y/valid-lang"]

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Disable all Accessibility rules

squirrel.toml
[rules]
disable = ["a11y/*"]

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Enable only this rule

squirrel.toml
[rules]
enable = ["a11y/valid-lang"]
disable = ["*"]