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chromium/third_party/blink/web_tests/external/wpt/html/browsers/the-window-object/named-access-on-the-window-object/removing.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Named access on the window object - Removing elements</title>
<link rel="author" title="Matthew Phillips" href="mailto:[email protected]">
<link rel="help" href="https://html.spec.whatwg.org/#named-access-on-the-window-object">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<body>
<script>
"use strict";

test(() => {
  const img = document.createElement("img");
  img.setAttribute("id", "foo");
  document.body.appendChild(img);
  assert_equals(window.foo, img);

  document.body.removeChild(img);
  assert_false("foo" in window);
}, "Removing an element must update the named properties");

test(() => {
  const text = document.createTextNode("foo");
  document.body.appendChild(text);

  const img = document.createElement("img");
  img.setAttribute("id", "removed");
  document.body.appendChild(img);
  assert_equals(window.removed, img);

  document.body.removeChild(text);
  assert_equals(window.removed, img);
}, "Removing a non-element node must not cause errors");
</script>