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+<!DOCTYPE HTML>
+<html>
+<head>
+ <meta charset="utf-8">
+ <meta name="viewport" content="width=device-width; initial-scale=1.0">
+ <title>Dragging the mouse on a inactive scrollframe's scrollbar</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>
+ <style>
+ #scrollable {
+ overflow: scroll;
+ height: 200px;
+ width: 200px;
+ }
+ .content {
+ width: 1000px;
+ height: 2000px;
+ }
+ </style>
+ <script type="text/javascript">
+
+async function test() {
+ var scrollableDiv = document.getElementById("scrollable");
+ let scrollPromise = new Promise(resolve => {
+ scrollableDiv.addEventListener("scroll", resolve, {once: true});
+ });
+
+ var dragFinisher = await promiseVerticalScrollbarDrag(scrollableDiv);
+ if (!dragFinisher) {
+ ok(true, "No scrollbar, can't do this test");
+ return;
+ }
+
+ // the events above might be stuck in APZ input queue for a bit until the
+ // layer is activated, so we wait here until the scroll event listener is
+ // triggered.
+ await scrollPromise;
+
+ await dragFinisher();
+
+ // Flush everything just to be safe
+ await promiseOnlyApzControllerFlushed();
+
+ // After dragging the scrollbar 20px on a 200px-high scrollable div, we should
+ // have scrolled approx 10% of the 2000px high content. There might have been
+ // scroll arrows and such so let's just have a minimum bound of 50px to be safe.
+ ok(scrollableDiv.scrollTop > 50, "Scrollbar drag resulted in a scroll position of " + scrollableDiv.scrollTop);
+}
+
+waitUntilApzStable()
+.then(test)
+.then(subtestDone, subtestFailed);
+
+ </script>
+</head>
+<body>
+ <div id="scrollable">
+ <div class="content">Some content inside the inactive scrollframe</div>
+ </div>
+ <div class="content">Some content to ensure the root scrollframe is scrollable and the overflow:scroll div remains inactive</div>
+</body>
+</html>