Find your device pixel ratio!

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<!DOCTYPE html>
<html>
  <head>
    <title>device pixel ratio!</title>
    <style>
      body {
        font:bold 150px 'Helvetica';
      }
    </style>
  </head>
  <body>
    <script>
        document.body.innerHTML = window.devicePixelRatio;
    </script>
  </body>
</html>
​
    