HTML Lang Attribute Checker
Checks <html> declares a valid lang attribute.
What this tool checks
HTML lang attribute
Checks <html> has a valid lang attribute.
Why it matters: The lang attribute tells browsers and assistive technology which language the page is in, affecting pronunciation, hyphenation and translation prompts.
If it fails: Set a valid language code, e.g. <html lang="en"> or <html lang="en-GB">.
Source: w3.org/International/questions/qa-html-language-declarations
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