এইচটিএমএল onstorage

<!DOCTYPE html>
<html>
<body>

<button onclick="saveData()">ডেটা সংরক্ষণ করুন</button>

<p id="message"></p>

<script>
window.onstorage = function(event) {
  document.getElementById("message").innerHTML =
    event.key;
};

function saveData() {
  localStorage.setItem("name", "Arif");
}
</script>

</body>
</html>