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<!DOCTYPE html>
<head>
  <style>
@page {
  size: letter;
  margin: 0;
}
body{
  margin:0;
}
div{
  /* A4-on-letter requires a 0.9407 downscale. 11in = 279.4mm, and
   * 279.4mm / 297mm = 0.9407407407..
   * The unscaled reference case has a 200px square div, so reverse the scale
   * to match that (rounding to 0.940741)
   */
  height: calc(0.940741 * 200px);
  width: calc(0.940741 * 200px);
  background: blue;
  margin: auto;
}
  </style>
</head>
<body>
  <div></div>
</body>