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chromium/third_party/blink/web_tests/external/wpt/html/browsers/the-window-object/garbage-collection-and-browsing-contexts/discard_iframe_history_4.html 

<!doctype html>
<title>Removing iframe from document removes it from history</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
var t = async_test();
var w = window.open("discard_iframe_history_4-1.html");
</script>