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<!DOCTYPE html>
<html>
<head>
<style>
/* Default CSS Values */
body {
  display: block;
  margin: 8px;
}
 
body:focus {
  outline: none;
}
</style>
</head>
<body>
The content of the document......
<p>Change the default CSS settings to see the effect.</p>
</body>
</html>