<head>
<title>Ensure that the hit region doesn't get unexpectedly expanded
<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="application/javascript">
async function test() { var scroller = document.getElementById("scroller"); var scrollerPos = scroller.scrollTop; var dx = 100, dy = 50;
is(window.scrollY, 0, "Initial page scroll position should be 0");
is(scrollerPos, 0, "Initial scroller position should be 0");
is(window.scrollY, 0, "Page scroll position should still be 0");
ok(scroller.scrollTop > scrollerPos, "Scroller should have scrolled");
// wait for it to layerize fully and then try again
await promiseAllPaintsDone();
await promiseOnlyApzControllerFlushed();
scrollerPos = scroller.scrollTop;
await promiseMoveMouseAndScrollWheelOver(scroller, dx, dy);
is(window.scrollY, 0, "Page scroll position should still be 0 after layerization");
ok(scroller.scrollTop > scrollerPos, "Scroller should have continued scrolling");
}
<div id="scroller">
Scrolling on the very left edge of this div will work.
Scrolling on the right side of this div (starting with the left edge of the orange box above) should work, but doesn't.
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