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Checks that lang and xml:lang attributes match on html element
Rule IDa11y/html-xml-lang-mismatch
CategoryAccessibility
ScopePer-page
Severityerror
Weight6/10

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Solution

If both lang and xml:lang are present on the <html> element, they must have the same base language. Mismatches can cause screen readers to announce content in the wrong language. Typically, you only need lang for HTML5 documents.

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Enable / Disable

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Disable this rule

squirrel.toml
[rules]
disable = ["a11y/html-xml-lang-mismatch"]

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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/html-xml-lang-mismatch"]
disable = ["*"]