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chromium/third_party/blink/web_tests/fast/media/mq-unknown-ident-values.html 

<!DOCTYPE html>
<html>
<head>
  <title>Media queries with invalid ident values must be dropped</title>
  <style>
    @media not all and (orientation: block) {
      #t1 { color: red; }
    }
    @media not all and (pointer: landscape) {
      #t2 { color: red; }
    }
    @media not all and (scan: none) {
      #t3 { color: red; }
    }
  </style>
</head>
<body>
  <div id="t1">Should not be red</div>
  <div id="t2">Should not be red</div>
  <div id="t3">Should not be red</div>
</body>
</html>