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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width; initial-scale=1.0">
<title>Test that scrollBy() doesn't scroll more than it should</title>
<script type="application/javascript" src="apz_test_native_event_utils.js"></script>
<script type="application/javascript" src="apz_test_utils.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<script type="application/javascript">
async function test() {
const maxSteps = 20;
let scrollPerStep = 40;
for (let step = 0; step < maxSteps; step++) {
window.scrollBy(0, scrollPerStep);
await promiseFrame();
}
is(window.scrollY, maxSteps * scrollPerStep, "Scrolled by the expected amount");
}
waitUntilApzStable()
.then(test)
.then(subtestDone, subtestFailed);
</script>
<style>
body {
height: 5000px;
background: linear-gradient(red, black);
}
</style>
</head>
<body>
</body>
</html>
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