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+<head>
+ <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 type="application/javascript" src="/tests/SimpleTest/paint_listener.js"></script>
+ <script type="application/javascript">
+
+function* test(testDriver) {
+ 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;
+ yield moveMouseAndScrollWheelOver(subframe, 100, 100, testDriver);
+ dump("after scroll, subframe.scrollTop = " + subframe.scrollTop + "\n");
+ ok(subframe.scrollTop > scrollPos, "subframe scrolled after wheeling over it");
+}
+
+waitUntilApzStable()
+.then(runContinuation(test))
+.then(subtestDone);
+
+ </script>
+ <style>
+ #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 */
+ }
+ </style>
+</head>
+<body>
+ <div id="scroll">
+ <div id="scrolled"></div>
+ </div>
+ <div style="height: 5000px;"></div><!-- So the page is scrollable as well -->
+</body>
+</head>