HTML Checking for Large Sites

Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.

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 lang property.

Example:

<html lang="en">

Learn more:

Related W3C validator issues