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<!DOCTYPE>
<head>
  <style>
    body {
      border:  0px;
      margin:  0px;
      padding: 0px;
    }
    div {
      width:   100px;
      height:  200px;
      border:  50px solid black;
      margin:  50px;
      padding: 50px;

      /* This is deliberately an image with a non-neutral inherent orientation to */
      /* ensure that the inherent orientation is irrelevant. */
      background-image:    url(image-exif-90-deg-flip.jpg);
      background-position: center;
      background-repeat:   no-repeat;
    }
  </style>
</head>
<body>
  <div></div>

  <script>
    var fromImage = location.search == "from-image";

    // Construct a style.
    var style;
    if (fromImage) {
      style = "div { image-orientation: from-image; }\n";
    } else {
      style = "div { image-orientation: none; }\n";
    }

    // Apply the style to the document.
    var sheet = document.createElement('style');
    sheet.innerHTML = style;
    document.body.appendChild(sheet);
  </script>
</body>