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<!DOCTYPE html>
<html>
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<style>
body { margin: 0; padding: 10px; }
.space { height: 2000px; }
#scroller {
border: 3px solid green;
position: absolute;
z-index: 0;
overflow: auto;
padding: 10px;
width: 250px;
height: 150px;
}
.ifr {
border: 3px solid blue;
width: 200px;
height: 100px;
}
</style>
</head>
<body>
<div id=scroller>
<iframe srcdoc="SCROLL ME" class=ifr></iframe>
<div class=space></div>
</div>
<div class=space></div>
<script>
promise_test(async t => {
await new test_driver.Actions().scroll(50, 50, 0, 50).send();
// Allow the possibility the scroll is not fully synchronous
await t.step_wait(() => scroller.scrollTop === 50);
}, "Wheel scroll in iframe chains to containing element.");
</script>
</body>
</html>
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