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<html>
<head>
<script type="text/javascript">
function formAction(){
var x=document.getElementById("mySelect")
alert(x.length)
}
</script>
</head>
<body>
<form>
<select id="mySelect">
<option>1</option>
<option>2</option>
<option>3</option>
</select>
<input type="button" onclick="formAction()" value="How many options in the list?">
</form>
</body>
</html>
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