HTML5 offers two new objects for storing data on the client:
LocalStorage - stores data with no time limit
<script type="text/javascript">
localStorage.lastname="Smith";
document.write(localStorage.lastname);
</script>
SessionStorage - stores data for one session.The data is deleted when the user closes the browser window.
<script type="text/javascript">
sessionStorage.lastname="Smith";
document.write(sessionStorage.lastname);
</script>