does the dom only work for one document code example

Example 1: DOM

<body onload="window.alert('Welcome to my home page!');">

Example 2: dom javascript frontend

<!DOCTYPE html>
<html>
  <head>
    <title>DOM Page</title>
  </head>
  <body>
    <h1>The main heading</h1>
    <p class="highlight">An interesting summary of this content.</p>
    <p>
      Some supplementary details to accompany our discussion.
             It also has a <a href="#">link</a>.
    </p>
    <div class="widget">
      <div class="foo"></div>
    </div>
    <table>
      <thead>
        <tr>
          <th>School</th>
          <th>Color</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td>UNC Chapel Hill</td>
          <td>Carolina Blue</td>
        </tr>
        <tr>
          <td>NC State</td>
          <td>Wolfpack Red</td>
        </tr>
      </tbody>
    </table>
  </body>
</html>

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Html Example

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