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<!DOCTYPE html>
<html>
<head>
<style>
/* Default CSS Values */
p {
  display: block;
  margin-top: 1em;
  margin-bottom: 1em;
  margin-left: 0;
  margin-right: 0;
}
</style>
</head>
<body>
<p>This is a p element (how it is displayed by default).</p>
<p style="margin-left:50px;">This is a customized p element (changed margin-left).</p>
</body>
</html>