window-event-override-no-crash.html

<html>
<body>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();

window.event = new Object;
var iframe = document.createElement("iframe");
document.body.appendChild(iframe);
iframe.src = "resources/blank.html";
</script>
This test ensures that window.event can be set to a meaningless object (and immediately be used internally) without causing a crash.
</body>
</html>

chromium/third_party/blink/web_tests/fast/dom/Window/window-event-override-no-crash.html