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<!DOCTYPE HTML>
<html>
<head>
<title>Test hit-testing on content which is revealed by async scrolling</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>
#parent {
width: 400px;
height: 400px;
overflow: auto;
}
#child {
margin-top: 200px;
width: 100%;
height: 100px;
overflow: auto;
}
#obscurer {
position: absolute;
top: 200px;
width: 400px;
height: 200px;
background: blue;
}
.spacer {
width: 100%;
height: 1000px;
background: green;
}
</style>
</head>
<body>
<div id="parent">
<div id="child">
<div class="spacer"></div>
</div>
<div class="spacer"></div>
</div>
<div id="obscurer"></div>
</body>
<script type="application/javascript">
async function test() {
var config = getHitTestConfig();
var utils = config.utils;
// Create APZCs for parent and child scrollers.
let parent = document.getElementById("parent"); // otherwise parent refers to window.parent
utils.setDisplayPortForElement(0, 0, 400, 1000, parent, 1);
utils.setDisplayPortForElement(0, 0, 400, 1000, child, 1);
await promiseApzFlushedRepaints();
// Async-scroll the parent scroller by 100 pixels, thereby revealing
// the child which was previous covered by "obscurer".
utils.setAsyncScrollOffset(parent, 0, 100);
// Give WebRender a chance to sample the test async scroll offset.
utils.advanceTimeAndRefresh(16);
utils.restoreNormalRefresh();
// Check that hit-testing on the region where the child scroller's
// contents are now revealed, successfully hits the scroller.
checkHitResult(hitTest({x: 200, y: 150}),
APZHitResultFlags.VISIBLE,
utils.getViewId(child),
utils.getLayersId(),
"child scroller");
}
waitUntilApzStable()
.then(test)
.then(subtestDone, subtestFailed);
</script>
</html>
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