HTML Tidy accessibility-check 1.0/4.3.1 - The HTML element does not contain a lang attribute

This demonstrates an <html> that does not contain a "lang" attribute

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html>
<head>
<title>aert1.0/4.3.1 - The HTML element does not contain a lang attribute</title>
</head>
<body>
</body>
</html>