chromium/third_party/blink/web_tests/fast/dom/gc-attribute-node.html

<!DOCTYPE html>
<script src="../../resources/js-test.js"></script>
<body>
<script>
description('Tests that attribute node wrappers are not prematurely garbage collected');

var e = document.createElement('div');
document.body.appendChild(e);
e.setAttribute('id', 'd');
e.setAttribute('foo', 'bar');
a = e.getAttributeNode('foo');
a.prop = 'set';
shouldBe('a.prop', '"set"');

a = null;
e = null;
gc();

e = document.body.querySelector('div#d');
a = e.getAttributeNode('foo');
shouldBe('a.prop', '"set"');

successfullyParsed = true;
</script>