Pasted

<!DOCTYPE html>
<html lang="it">
<head>
</head>
<body>
<h1>Demo di localstorage</h1>
<textarea id="area" rows="10" cols="80"></textarea>
<p></p>
<button onclick="salva()">Salva</button>
<button onclick="carica()">Carica</button>
<script>
  function salva() {
    var contenuto = document.getElementById("area").value;
    localStorage.setItem("contenuto", contenuto);
  }
  function carica() {
    var contenuto = localStorage.getItem("contenuto");
    document.getElementById("area").value = contenuto;
  }
</script>
</body>
</html>