testing/web-platform/tests/html/browsers/the-window-object/window-indexed-properties-delete-no-cache.html
author Morgan Reschenberg <mreschenberg@mozilla.com>
Tue, 18 Jan 2022 23:31:21 +0000
changeset 605085 4c684d5d16fe3a85614e7cb56be8c0029dc98b12
parent 583100 7cb800d92d4bd99a79ec834574a27d8d126cd724
permissions -rw-r--r--
Bug 1748878: Use LayoutDeviceInt types for points, rects, sizes in dev pixels r=Jamie,emilio a=graft Differential Revision: https://phabricator.services.mozilla.com/D135272

<!doctype html>
<meta charset=utf-8>
<title>Deletion of WindowProxy's indexed properties is not cached</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/window-object.html#windowproxy-delete">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<script>
const iframe = document.createElement("iframe");
iframe.srcdoc = "";

test(() => {
  assert_equals(window.length, 0);
  for (let i = 0; i < 1e5; i++) {
    assert_true(delete window[0]);
  }

  document.body.append(iframe);
  assert_false(delete window[0]);
}, "Absence of index '0' is not cached");

test(() => {
  assert_equals(window.length, 1);
  for (let i = 0; i < 1e5; i++) {
    assert_false(delete window[0]);
  }

  iframe.remove();
  assert_true(delete window[0]);
}, "Presence of index '0' is not cached");
</script>