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chromium/third_party/blink/web_tests/fast/dom/HTMLIsIndexElement/prototype-chain.html 

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<script src="../../../resources/js-test.js"></script>
</head>
<body>
<script>
description("HTMLIsIndexElement should inherit directly from HTMLElement and be an HTMLUnknownElement");

var isIndex = document.createElement("isindex");

shouldBe("isIndex.__proto__", "HTMLUnknownElement.prototype");
shouldBe("isIndex.__proto__.__proto__", "HTMLElement.prototype");

shouldBeUndefined("isIndex.prompt");
shouldBeUndefined("isIndex.form");

shouldBeUndefined("isIndex.defaultValue");
shouldBeUndefined("isIndex.disabled");
shouldBeUndefined("isIndex.multiple");
shouldBeUndefined("isIndex.alt");
shouldBeUndefined("isIndex.accept");
</script>
</body>
</html>