HTML Checking for Large Sites

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The element “footer” must not appear as a descendant of the “footer” element.

A <footer> can’t include other <footer>s 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.

Learn more about <footer> in the HTML spec.