gecko-dev/testing/web-platform/tests/XMLHttpRequest/event-load.htm

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<!doctype html>
<meta charset=utf-8>
<title>XMLHttpRequest: The send() method: Fire an event named load (synchronous flag is unset)</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onload" data-tested-assertations="../.." />
<link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-load" data-tested-assertations="../.." />
<link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::a[contains(@href,'#switch-done')]/.." />
<link rel="help" href="https://xhr.spec.whatwg.org/#switch-done" data-tested-assertations="following::ol/li[6]" />
<div id="log"></div>
<script>
var test = async_test();
test.step(function() {
var client = new XMLHttpRequest();
client.onload = test.step_func(function(e) {
assert_true(e instanceof ProgressEvent);
assert_equals(e.type, "load");
assert_equals(client.readyState, 4);
test.done();
});
client.onreadystatechange = test.step_func(function() {
if (client.readyState !== 4) return;
setTimeout(test.step_func(function() {
assert_unreached("Didn't get load event within 4ms of readystatechange==4");
}), 4);
});
client.open("GET", "resources/well-formed.xml");
client.send(null);
});
</script>