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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width; initial-scale=1.0">
<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="text/javascript">
const utils = SpecialPowers.getDOMWindowUtils(window);
async function test() {
let resolution = 3.0;
utils.setResolutionAndScaleTo(resolution);
await promiseApzFlushedRepaints();
let scrollPromise = new Promise(resolve => {
subframe.addEventListener("scroll", resolve, { once: true });
});
var dragFinisher = await promiseVerticalScrollbarDrag(subframe, 20);
if (!dragFinisher) {
ok(true, "No scrollbar, can't do this test");
return;
}
// the events above might be stuck in APZ input queue for a bit until the
// layer is activated, so we wait here until the scroll event listener is
// triggered.
await scrollPromise;
await dragFinisher();
// Flush everything just to be safe
await promiseOnlyApzControllerFlushed();
ok(subframe.scrollTop > 0, "Scrollbar drag resulted in a scroll position of " + subframe.scrollTop);
}
waitUntilApzStable()
.then(test)
.then(subtestDone, subtestFailed);
</script>
<style>
#subframe {
width: 200px;
height: 100px;
margin: 100px;
background-color: cyan;
overflow: scroll;
white-space: pre;
}
#content {
width: 200px;
height: 200px;
background: linear-gradient(green, blue);
}
</style>
</head>
<body>
<div id="subframe">
<div id="content"></div>>
</div>
</body>
</html>