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HTML Guide

Free site validation

Find out what web pages on your sites are affected by HTML issues.

This document appears to be written in X but the “html” start tag has “lang=Y”.

Based on the content of the document, the W3C validator has determined that the main language doesn’t match the one specified in the lang property of the <html> tag. Check the language of the document, if it matches the lang property you can safely ignore and mute this warning.

Related W3C validator issues