third_party/web_platform_tests/html/browsers/the-window-object/garbage-collection-and-browsing-contexts/discard_iframe_history_3-3.html

<button onclick="var p = parent; p.push_length(); frameElement.parentNode.removeChild(frameElement); p.push_length(); p.do_test();">Click me</button>
<script>
onload = function() {setTimeout(parent.t.step_func(function() {document.getElementsByTagName("button")[0].click()}), 100)}
</script>