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<!DOCTYPE html>
<html>
<head>
<link rel="help" href="https://www.w3.org/TR/cssom-view-1/">
<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, h1 { margin: 20px; }
#vp {
height: 400px;
width: 600px;
overflow: scroll;
left: 10px;
top: 10px;
border: 5px solid #8cf;
}
</style>
</head>
<body>
<div id="vp">
<div style="transform-style: preserve-3d">
<h1 style="height:2000px; transform: translateZ(0)">
Gazing into the stars
</h1>
</div>
</div>
<script>
promise_test(async () => {
let scroll_promise = new Promise((resolve, reject) => {
vp.addEventListener("scroll", resolve);
});
await new test_driver.Actions().scroll(100, 100, 0, 50).send();
await scroll_promise;
assert_true(vp.scrollTop > 0);
}, "Element is scrollable over preserve-3d descendant");
</script>
</body>
</html>
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