chromium/third_party/blink/web_tests/http/tests/misc/window-reuse-after-document-open.html

<iframe id="i" src="https:/127.0.0.1:8443/misc/resources/hang-connection-before-head.php"></iframe>
<script>
if (window.testRunner) {
  testRunner.dumpAsText();
  testRunner.waitUntilDone();
}
i.contentWindow.didreuse = true;
i.contentDocument.open();
i.contentDocument.close();
i.contentWindow.location = 'resources/check-window-reuse.html';
</script>