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

<!DOCTYPE html>
<meta charset="utf-8">
<title>Named access on the window object - Multiple matches</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 img1 = document.createElement("img");
  img1.setAttribute("name", "foo");
  document.body.appendChild(img1);

  const img0 = document.createElement("img");
  img0.setAttribute("name", "foo");
  document.body.insertBefore(img0, img1);

  const div = document.createElement("div");
  div.setAttribute("id", "foo");
  document.body.appendChild(div);

  assert_true(window.foo instanceof window.HTMLCollection);
  assert_equals(window.foo.length, 3);
  assert_true(window.foo[0] === img0);
  assert_true(window.foo[1] === img1);
  assert_true(window.foo[2] === div);
}, "A named property must return a HTMLCollection if there are multiple matches");
</script>