chromium/third_party/blink/web_tests/http/tests/navigation/back-to-slow-frame.html

<script>
if (window.testRunner) {
    testRunner.dumpBackForwardList();
    testRunner.dumpAsText();
    testRunner.queueLoad("resources/back-to-slow-frame-2.html");
    testRunner.queueLoad("resources/back-to-slow-frame-3.html");
    testRunner.queueBackNavigation(1);
}
</script>
<p>This test checks that going back and forth across a slow-loading frame doesn't crash.
<p>If testing manually, <a href="resources/back-to-slow-frame-2.html">click here</a>.