Rocket Validator automatically scans your sites for accessibility issues using the W3C Validator,
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This document appears to be written in English but the “html” start tag has an empty “lang” attribute. Consider using “lang="en"” (or variant) instead.
Based on the content of the document, the W3C validator thinks that it’s written in English. Consider explicitly specifying the language using the
Related W3C validator issues
Instead of using the isolang attribute to define the language of the document, you can use lang with an ISO 639-1 two character code.
For example, for Portuguese:
Always use a language attribute on the <html> tag to declare the default language of the text in the page, using the lang property.