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Test Info:

<!doctype html>
<meta charset=utf-8>
<title></title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
async_test((t) => {
const et = new EventTarget();
et.addEventListener('test', t.step_func_done((e) => {
assert_true(e.cancelable);
}), {passive: true});
et.dispatchEvent(new Event('test', {cancelable: true}));
}, "A generic event with only passive listeners remains cancelable");
</script>