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selectObject.form
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<html>
<body>
<form id="myForm">
<select id="mySelect">
<option>Apple</option>
<option>Pear</option>
<option>Banana</option>
<option>Orange</option>
</select>
</form>
<p>The id of the form is:
<script type="text/javascript">
document.write(document.getElementById("mySelect").form.id
)
</script>
</p>
</body>
</html>