<!DOCTYPE HTML>
<html>
<body>
<script src="../../../resources/js-test-pre.js"></script>
<script>

description('Tests that removing and inserting an input element always invalidates the cache in the labels node list');

var iframe = document.createElement('iframe');
document.body.appendChild(iframe);
var doc = iframe.contentDocument;

doc.body.innerHTML = '<form><label><input id=someInput></label><label for=someInput></label></form><input id=otherInput>';
var input = doc.getElementById('someInput');
var form = doc.querySelector('form');
form.elements[0];
input.labels[0];
form.id = 'someId';
form.remove();
doc.body.appendChild(input);

shouldBe('input.labels.length', '0');

</script>
<script src="../../../resources/js-test-post.js"></script>
</body>
</html>