<html>
<body bgcolor="white">
<script language="JavaScript">
var val = window.localStorage.getItem('val');
function addLine() {
  if(val == null)
    val = '<br/>One Line.';
  else
    val += '<br/>Another Line.';
  window.localStorage.setItem('val', val);
  document.getElementById('out').innerHTML = val;
}
</script>
Click the "Add Line" button to add a line or the "Clear" button to clear.<br/>
This data will persist across sessions if a cache path was specified.<br/>
<input type="button" value="Add Line" onClick="addLine();"/>
<input type="button" value="Clear" onClick="window.localStorage.removeItem('val'); window.location.reload();"/>
<div id="out"></div>
<script language="JavaScript">
if(val != null)
  document.getElementById('out').innerHTML = val;
</script>
</body>
</html>