<!DOCTYPE html>
<html>
<body>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.overridePreference("WebKitUsesPageCachePreferenceKey", 1);
    testRunner.waitUntilDone();
}
</script>
<iframe id="iframe"></iframe>
<script>
var frame = document.getElementById("iframe");
frame.contentWindow.onunload = () => {
    var link = document.createElement('a');
    link.href = "about:blank";
    link.click();

    window.setTimeout(() => {
        // Do nothing.
    }, 0);
};
window.location = 'javascript:"PASS did not crash.<script>window.testRunner && window.testRunner.notifyDone();</' + 'script>"';
</script>
</body>
</html>