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<!DOCTYPE HTML>
<html>
<head>
<title>APZ overscroll handoff for fixed elements</title>
<script type="application/javascript" src="apz_test_utils.js"></script>
<script type="application/javascript" src="apz_test_native_event_utils.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<meta name="viewport" content="width=device-width"/>
<style>
html, body {
height: 100%;
overflow: hidden;
}
#main {
height: 100%;
overflow: auto;
}
#spacer {
height: 5000px;
}
#fixed {
position: fixed;
top: 50%;
left: 0;
width: 100%;
height: 100px;
background: red;
overflow: auto;
}
#long {
height: 250px;
width: 50%;
position: absolute;
background: green;
top: 0;
left: 25%;
}
</style>
</head>
<body>
<div id="main">
<div id="spacer">
</div>
<div id="fixed">
<div id="long">
</div>
</div>
</div>
</body>
<script type="application/javascript">
async function test() {
// Scroll to the bottom of the fixed position element that should not
// allow overscroll handoff.
fixed.scrollTop = fixed.scrollHeight;
// After scrolling to bottom tick the refresh driver.
await promiseFrame();
info("Start: fixed=" + fixed.scrollTop + " main=" + main.scrollTop);
// Async scroll the fixed element by 200 pixels using the mouse-wheel.
// This should not handoff the overscroll.
await promiseMoveMouseAndScrollWheelOver(fixed, 50, 50, false, 200);
// Make sure scrolling that has happened is propagated to the main thread.
await promiseApzFlushedRepaints();
// Try another gesture to ensure the overscroll handoff runs.
await promiseMoveMouseAndScrollWheelOver(fixed, 50, 50, false, 200);
await promiseApzFlushedRepaints();
info("After scroll: fixed=" + fixed.scrollTop + " main=" + main.scrollTop);
// Ensure that the main element has not scrolled.
is(main.scrollTop, 0, "The overscroll should not handoff");
}
waitUntilApzStable()
.then(test)
.then(subtestDone, subtestFailed);
</script>
</html>
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