HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>Button JavaScript Example</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}p{margin:0 0 1rem;font-size:.95rem}button{font-size:.95rem;padding:.5rem 1rem;cursor:pointer}#message{margin-top:.75rem;font-size:.9rem;color:#166534}</style>

</head>

<body>

  <h1>Button with JavaScript</h1>

  <button type=button id=greet-btn>Say Hello</button>

  <p id=message></p>

  <script>document.getElementById("greet-btn").addEventListener("click",(function(){document.getElementById("message").textContent="Hello! Button was clicked."}))</script>

</body>

</html>

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HTML button Tag — JavaScript Click Handler