chromium/src/third_party/blink/web_tests/fast/parser/iframe-sets-parent-to-javascript-url.html

<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.dumpChildFrames();
    testRunner.waitUntilDone();
}

function done() {
    if (window.testRunner)
        testRunner.notifyDone();
}
</script>
<iframe src="resources/set-parent-to-javascript-url.html"></iframe>