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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>XMLHttpRequest: progress events grow response body size</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::a[contains(@href,'#make-progress-notifications')]/.. following::a[contains(@href,'#make-progress-notifications')]/../following:p[1]" />
<link rel="help" href="https://xhr.spec.whatwg.org/#make-progress-notifications" data-tested-assertations=".." />
<link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onprogress" data-tested-assertations="/../.." />
<link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-progress" data-tested-assertations="/../.." />
</head>
<div id="log"></div>
<script>
var test = async_test();
test.step(function() {
var client = new XMLHttpRequest();
var lastSize = 0;
client.onprogress = test.step_func(function() {
var currentSize = client.responseText.length;
if (lastSize > 0 && currentSize > lastSize) {
// growth from a positive size to bigger!
test.done();
}
lastSize = currentSize;
});
client.onreadystatechange = test.step_func(function() {
if (client.readyState === 4) {
assert_unreached("onprogress not called multiple times, or response body did not grow.");
}
});
client.open("GET", "resources/trickle.py?count=1000");
client.send(null);
});
</script>
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