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chromium/third_party/blink/web_tests/dom/text/previous-element-sibling.html 

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

description('This tests the NonDocumentTypeChildNode interface previousElementSibling property on a Text node.');

var element = document.createElement('div');
var a = element.appendChild(new Text('a'));
shouldBeNull('a.previousElementSibling');
var b = element.insertBefore(document.createElement('b'), a);
shouldBe('a.previousElementSibling', 'b');
var c = element.insertBefore(new Comment('c'), a);
shouldBe('a.previousElementSibling', 'b');

</script>