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<!DOCTYPE html>
<html>
<head>
<style>
/* Default CSS Values */
hr {
  display: block;
  margin-top: 0.5em;
  margin-bottom: 0.5em;
  margin-left: auto;
  margin-right: auto;
  border-style: inset;
  border-width: 1px;
}
</style>
</head>
<body>
<p>A hr element is displayed like this:</p>
<hr>
<p>A customized hr element (changed border-width):</p>
<hr style="border-width:10px;">
</body>
</html>