test/media-ignore-print.html

<!doctype html>
<html>
<head>
  <style type="text/css">
    body {
      background-color: red;
    }
    @media print {
      body {
        background-color: white;
      }
    }
  </style>

  <script>
    window.expectedStyle = {
      '': {
        'body': {
          'background-color': 'red',
        }
      }
    };
  </script>
</head>
<body>
  <p>Hi</p>
</body>
</html>