Access: [13.2.1.1]: Metadata missing (Priority 2)

Cause:

Metadata should describe or provide specific information about individual web documents. Metadata is commonly used to list keywords so that search engines can conduct a more accurate and refined search. It can also include: content ratings, author information, site maps, stream channel definitions, a document's primary language, and digital library collections.

Example:

Good
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html lang="en">
<head>
</head>
<body>
</body>
</html>

Solution:

References: