Untitled

<html>
<head>
  <title>Dummy file</title>
  <!-- CSS stilizavimas -->
  <style>
    #mygtukas {
      border-style: solid;
      border-color: #000000;
      border-width: 1px;
      background: #FFFFFF;
      color: #000000;
    }
  </style>

  <!-- Interaktyvumas -->
  <script>
  window.addEventListener('load', function () {
	var text = document.getElementById("inputas");
      document.getElementById("mygtukas").addEventListener('click', function () {
        alert(text.value);
      });
    });
  </script>
</head>
<body>
	<button id="mygtukas">Paspausk mane</button>
	<input type="text" id="inputas" value="">
</body>
</html>