<!DOCTYPE html>
<html>
<body>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.dumpChildFramesAsText();
    testRunner.waitUntilDone();
    if (testRunner.setShouldDecideNavigationPolicyAfterDelay)
        testRunner.setShouldDecideNavigationPolicyAfterDelay(true);
}
var parentFrame = document.body.appendChild(document.createElement("iframe"));
parentFrame.src = "data:text/html,";

var childFrame = parentFrame.contentDocument.body.appendChild(document.createElement("iframe"));
childFrame.contentWindow.onunload = function () {
    var link = parentFrame.contentDocument.createElement("a");
    link.href = "data:text/html,PASS did not crash.<script>window.testRunner && window.testRunner.notifyDone()</" + "script>";
    link.click(); // Navigates parentFrame
}
</script>
</body>
</html>