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<!DOCTYPE html>
<html>
<head>
<style>
/* Default CSS Values */
h3 {
  display: block;
  font-size: 1.17em;
  margin-top: 1em;
  margin-bottom: 1em;
  margin-left: 0;
  margin-right: 0;
  font-weight: bold;
}
</style>
</head>
<body>
<p>An h3 element is displayed like this:</p>
<h3>This is heading 3</h3>
<p>A customized h3 element (changed font-weight):</p>
<h3 style="font-weight:normal;">This is heading 3</h3>
</body>
</html>