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chromium/third_party/blink/web_tests/fast/dom/interface-object-proto.html 

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

<script>
description("Tests the prototype chain of interface objects");

shouldBe('Object.getPrototypeOf(HTMLBodyElement)', 'HTMLElement');
shouldBe('Object.getPrototypeOf(HTMLElement)', 'Element');
shouldBe('Object.getPrototypeOf(Element)', 'Node');
shouldBe('Object.getPrototypeOf(Node)', 'EventTarget');
shouldBe('Object.getPrototypeOf(EventTarget)', 'Function.prototype');

</script>
</body>
</html>