HTML Checking for Large Sites

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When the attribute “xml:lang” in no namespace is specified, the element must also have the attribute “lang” present with the same value.

Elements that have the xml:lang attribute also need a matching lang attribute. In HTML5 documents, using just the lang attribute is enough.

Related W3C validator issues

25,000 HTML checks per month. Is that enough for your site?

Save time using our automated web checker. Let our crawler check your web pages on the W3C Validator.