HTML Checking for Large Sites

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

A <header> section can’t include any <footer> section inside.

The footer element represents a footer for its nearest ancestor sectioning content or sectioning root element. A footer typically contains information about its section such as who wrote it, links to related documents, copyright data, and the like.

Footers don’t necessarily have to appear at the end of a section, though they usually do. In any case, they can’t go nested inside a <header> section.

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Related W3C validator issues