<!DOCTYPE html>
<html>
<body>
<script src="../../resources/js-test.js"></script>
<form id="form1"><option id="option1"></form>
<form id="form2"><optgroup><option id="option2"></optgroup></form>
<form id="form3"><select><option id="option3"></select></form>
<form id="form4"><select><optgroup><option id="option4"></optgroup></select></form>
<form id="form5a"></form><form id="form5b"><select form="form5a"><option id="option5"></select></form>
<script>
description(`This tests option element's form IDL attribute returns null when it's not associated with a select element.`);
shouldBeNull('option1.form');
shouldBeNull('option2.form');
shouldBe('option3.form', 'form3');
shouldBe('option4.form', 'form4');
shouldBe('option5.form', 'form5a');
</script>
</body>
</html>
