HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>firstElementChild read</title>
</head>
<body>
  <ul id="list">
    <li>First (1)</li>
    <li>Second (2)</li>
    <li>Third (3)</li>
  </ul>
  <pre id="out"></pre>
  <script>
    var list = document.getElementById("list");
    document.getElementById("out").textContent = list.firstElementChild.textContent;
  </script>
</body>
</html>

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Element.firstElementChild — MDN read (Try It)