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<title>APZ hit-testing over a checkerboarded area</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"/>
<div id="scroller" style="width: 300px; height: 300px; overflow:scroll; margin-top: 100px; margin-left: 50px">
<!-- Make the contents tall enough to be sure we can checkerboard -->
<div id="contents" style="width: 100%; height: 5000px; background-image: linear-gradient(blue,red)">
<div id="make_root_scrollable" style="height: 5000px"></div>
<script type="application/javascript">
async function test() {
var config = getHitTestConfig();
var utils = config.utils;
var scroller = document.getElementById("scroller");
// Activate the scrollframe but keep the main-thread scroll position at 0.
// Also apply an async scroll offset in the y-direction such that the
// scrollframe scrolls all the way to the bottom of its range, where it's
// sure to checkerboard.
utils.setDisplayPortForElement(0, 0, 300, 1000, scroller, 1);
await promiseApzFlushedRepaints();
var scrollY = scroller.scrollTopMax;
utils.setAsyncScrollOffset(scroller, 0, scrollY);
// Tick the refresh driver once to make sure the compositor has applied the
// async scroll offset (for WebRender hit-testing we need to make sure WR has
// the latest info).
var scrollerViewId = utils.getViewId(scroller);
// Hit-test the middle of the scrollframe, which is now inside the
// checkerboarded region, and check that we hit the scrollframe and
// not its parent.
"active scrollframe");
.then(subtestDone, subtestFailed);