Untitled

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
     <script>
        function stampa(){
							document.getElementById("input").value=document.getElementById("testo").innerHTML
        }
    </script>
</head>
<body>
    <b id="testo">Hello Word!!</b>


    <input id="input" type="text" style="width: 200px;">
    <button onclick="stampa()">Stampa</button>
  </body>

</html>