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<meta name="viewport" content="width=device-width; initial-scale=1.0">
<title>Wheel-scrolling over inactive subframe with z-index</title>
<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 subframe = document.getElementById("scroll");
// scroll over the middle of the subframe, and make sure that it scrolls,
// not the page
var scrollPos = subframe.scrollTop;
await promiseMoveMouseAndScrollWheelOver(subframe, 100, 100);
dump("after scroll, subframe.scrollTop = " + subframe.scrollTop + "\n");
ok(subframe.scrollTop > scrollPos, "subframe scrolled after wheeling over it");
.then(subtestDone, subtestFailed);
#scroll {
width: 200px;
height: 200px;
overflow: scroll;
#scrolled {
width: 200px;
height: 1000px; /* so the subframe has room to scroll */
z-index: 2;
background: linear-gradient(red, blue); /* so you can see it scroll */
transform: translateZ(0px); /* to force active layers */
will-change: transform; /* to force active layers */
<div id="scroll">
<div id="scrolled"></div>
<div style="height: 5000px;"></div><!-- So the page is scrollable as well -->