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Test Info:

// META: timeout=long
test(t => {
let xhr = new XMLHttpRequest();
let loadEventFired = false;
xhr.onprogress = t.unreached_func('progress event should not be fired');
xhr.onload = () => {
loadEventFired = true;
};
xhr.open('GET', 'resources/trickle.py?count=4&delay=150', false);
xhr.send();
// Check the load event as a sanity check that the test is working.
assert_true(loadEventFired, 'load event should have fired');
}, 'progress event should not be fired by sync XHR');