dropdown cache

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<!DOCTYPE html>
<html>
<head>
<title>Try jQuery Online</title>
<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script>
$(document).ready(function() {
   $("em").addClass("selected");
   $("#myid").addClass("highlight");
   
   if(localStorage.getItem('selected')!=null){
    console.log(localStorage.getItem('selected'));
	$('select[name="dropId"]').val(localStorage.getItem('selected'));
}
});
function a(val){
    localStorage.setItem('selected',val);
}
</script>
<style>
.selected { 
    color:red; 
}
.highlight { 
    background:yellow; 
}
</style>
</head>
<body>Car Model
<select id ="dropId" name="dropId" onChange="a(this.value)">
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="mercedes">Mercedes</option>
  <option value="audi">Audi</option>
</select>

</body>
</html>
dropdown cache

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