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<!DOCTYPE html>
<html>
<head>
<link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onloadstart" data-tested-assertations="../.." />
<link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-loadstart" data-tested-assertations="../.." />
<link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::ol[1]/li[8] following-sibling::ol/li[9]/ol/li[3]" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<title>XMLHttpRequest: The send() method: Fire a progress event named loadstart on the XMLHttpRequestUpload (synchronous flag is unset)</title>
</head>
<body>
<div id="log"></div>
<script type="text/javascript">
var test = async_test();
test.step(function()
{
var xhr = new XMLHttpRequest();
xhr.upload.onloadstart = function(e)
{
test.step(function()
{
assert_true(e instanceof ProgressEvent);
assert_equals(e.type, "loadstart");
assert_equals(e.target, xhr.upload);
test.done();
});
};
xhr.open("POST", "./resources/content.py", true);
xhr.send("Test Message");
});
</script>
</body>
</html>
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