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Test Info:

<!DOCTYPE html>
<meta charset="UTF-8">
<title>Event srcElement should be nullable</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<div id="target"></div>
<script>
test(() => {
const event = new Event('test');
assert_equals(event.srcElement, null);
const div = document.getElementById('target');
div.addEventListener('test', e => {
assert_not_equals(e.srcElement, null)
});
div.dispatchEvent(event);
}, 'Event srcElement should be nullable');
</script>
</body>