Inspector reports false errors like: <meta> is not allowed inside <body>. Moving <meta> into the <head>. Unmatched </head> encountered. Ignoring tag. Extra <body> encountered. Migrating attributes back to the original <body> element and ignoring the tag. They are false, there are no metas outsides head, nor extra bodys. Regards
Created attachment 31716 [details] screenshot
The errors are valid - the body is opened implicitly when a script calls document.write, writing content that is not allowed in head. Specifically, it's calendar.js that creates a table in body, even though it is loaded from head.
Thanks. I'll forward the problem to the project wonder team and calendar.js creator so they can fix.