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  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Aside</title>

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<body>
  <article>
    <h2>Main Article</h2>
    <p>The main content of the page goes here...</p>

    <!-- <aside> is content tangentially related to the main content -->
    <aside>
      <h3>Did you know?</h3>
      <p>HTML was invented in 1993 by Tim Berners-Lee.</p>
    </aside>
  </article>
</body>
</html>