HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <title>DOM update</title>

</head>

<body>

  <p id="greeting">Loading...</p>

  <button id="btn" type="button">Say Hello</button>



  <script>

    document.getElementById("btn").addEventListener("click", function () {

      document.getElementById("greeting").textContent = "Hello, JavaScript!";

    });

  </script>

</body>

</html>

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JavaScript Introduction — DOM Update