Other / Validation / Check Language on This Page W3C Bookmarklet

The Check Language bookmarklet displays the page's declared language using W3C methodology. Extracts the lang or xml:lang attribute from the html element, uses Intl.DisplayNames to convert the language code to a human-readable language name (e.g., "en" → "English"), displays a centered modal panel showing the detected language, or warns if no language is specified, and includes a link to W3C's "Checking Page Language" guidance. Close with X or dismiss link.

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