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Test Info:

<!doctype html>
<meta charset=utf-8>
<title>Deletion of WindowProxy's indexed properties is not cached</title>
<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>