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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>scroll handoff</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<script src="helper_fission_utils.js"></script>
<script src="apz_test_utils.js"></script>
<script src="apz_test_native_event_utils.js"></script>
<script>
fission_subtest_init();
FissionTestHelper.startTestPromise
.then(waitUntilApzStable)
.then(loadOOPIFrame("testframe", "helper_fission_empty.html"))
.then(waitUntilApzStable)
.then(test)
.then(FissionTestHelper.subtestDone, FissionTestHelper.subtestFailed);
async function test() {
let scrollEventPromise = new Promise(resolve => {
window.addEventListener("scroll", resolve, { once: true });
});
let iframe = document.getElementById("testframe");
await synthesizeNativeWheel(iframe, 100, 100, 0, -50);
await scrollEventPromise;
ok(window.scrollY > 0,
"Mouse wheel scrolling on OOP iframes in position:fixed subtree " +
"should be handed off to the parent");
}
</script>
</head>
<style>
iframe {
position: fixed;
width: 500px;
height: 500px;
}
</style>
<body>
<iframe id="testframe"></iframe>
<div style="height:1000vh"></div>
</body>
</html>