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diff --git a/testing/web-platform/tests/html/browsers/the-window-object/window-prototype-chain.html b/testing/web-platform/tests/html/browsers/the-window-object/window-prototype-chain.html
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+++ b/testing/web-platform/tests/html/browsers/the-window-object/window-prototype-chain.html
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+<!doctype html>
+<meta charset=utf-8>
+<title>Prototype chain of the window object</title>
+<link rel="author" title="Ms2ger" href="ms2ger@gmail.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#window">
+<link rel="help" href="https://dom.spec.whatwg.org/#eventtarget">
+<link rel="help" href="https://webidl.spec.whatwg.org/#interface-prototype-object">
+<link rel="help" href="https://webidl.spec.whatwg.org/#named-properties-object">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=log></div>
+<script>
+test(function() {
+  assert_class_string(window, "Window");
+}, "window object");
+test(function() {
+  var proto = Object.getPrototypeOf(window);
+  assert_equals(proto, Window.prototype);
+}, "Window.prototype");
+test(function() {
+  var gsp = Object.getPrototypeOf(Object.getPrototypeOf(window));
+  assert_class_string(gsp, "WindowProperties");
+}, "Global scope polluter");
+test(function() {
+  var protoproto = Object.getPrototypeOf(Object.getPrototypeOf(Object.getPrototypeOf(window)));
+  assert_equals(protoproto, EventTarget.prototype);
+}, "EventTarget.prototype");
+test(function() {
+  var protoprotoproto = Object.getPrototypeOf(Object.getPrototypeOf(Object.getPrototypeOf(Object.getPrototypeOf(window))));
+  assert_equals(protoprotoproto, Object.prototype);
+}, "Object.prototype");
+</script>