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

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<!DOCTYPE html>
<html>
<head>
<link rel="help" href="https://xhr.spec.whatwg.org/#the-abort()-method" data-tested-assertations="following-sibling::ol/li[4]/ol/li[7]/ol/li[3]" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<title>XMLHttpRequest: The abort() method: Fire a progress event named abort on the XMLHttpRequestUpload object</title>
</head>
<body>
<div id="log"></div>
<script type="text/javascript">
var test = async_test();
test.step(function()
{
var xhr = new XMLHttpRequest();
xhr.onloadstart = function()
{
test.step(function()
{
if (xhr.readyState == 1)
{
xhr.abort();
}
});
};
xhr.upload.onabort = function(e)
{
test.step(function()
{
assert_true(e instanceof ProgressEvent);
assert_equals(e.type, "abort");
assert_equals(e.target, xhr.upload);
test.done();
});
};
xhr.open("POST", "./resources/content.py", true);
xhr.send("Test Message");
});
</script>
</body>
</html>