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async_test(t => {
const img = new Image();
t.add_cleanup(() => img.remove());
img.onloadstart = img.onprogress = img.onloadend = t.unreached_func("progress event fired");
img.onload = t.step_func_done(e => {
assert_true(e instanceof Event);
assert_false(e instanceof ProgressEvent);
});
img.src = "/images/rrgg-256x256.png";
document.body.append(img);
}, "<img> does not support ProgressEvent or loadstart/progress/loadend");
test(t => {
assert_equals(document.body.onloadend, undefined);
assert_equals(window.onloadend, undefined);
}, "onloadend is not exposed");
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