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chromium/third_party/blink/web_tests/external/wpt/webstorage/resources/event_setattribute_handler.html 

<!DOCTYPE HTML>
<html>
<head></head>
<body>
<script>

function handleStorageEvent(e) {
    window.parent.storageEventList.push(e);
}

document.body.setAttribute("onstorage", "handleStorageEvent(event);");

</script>
</body>
</html>