the best way to idenify multiple webpages html code example

Example 1: multiple pages in one html file

<html>
<head>
<script>
function show(shown, hidden) {
  document.getElementById(shown).style.display='block';
  document.getElementById(hidden).style.display='none';
  return false;
}
</script>
</head>
<body>

  <div id="Page1">
    Content of page 1
    <a href="#" onclick="return show('Page2','Page1');">Show page 2</a>
  </div>

  <div id="Page2" style="display:none">
    Content of page 2
    <a href="#" onclick="return show('Page1','Page2');">Show page 1</a>
  </div>

</body>
</html>

Example 2: html multi page website

<nav>
  <ul>
    <li><a href="#">Navigation</a></li>
    <li><a href="#">Menu</a></li>
    <li><a href="#">Links</a></li>
  </ul>
</nav>

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