This test page is written in HTML 3.2 and validates at, for example, Validome

The source code is:

<DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<html>
<head>
  <meta http-equiv="content-type" content="text/html; charset=iso-8859-1"> ">
  <title>Testing the old meta http equiv thing</title>

  <meta http-equiv="Link" content="</labels.rdf>; /='/'; rel='meta' type='application/rdf+xml' ">

</head>
<body>
  Text
</body>
<html>