1<!DOCTYPE HTML>
2<script src="/resources/testharness.js"></script>
3<script src="/resources/testharnessreport.js"></script>
4<script src="/resources/testdriver.js"></script>
5<script src="/resources/testdriver-actions.js"></script>
6<script src="/resources/testdriver-vendor.js"></script>
7<script src="scroll_support.js"></script>
8<style>
9#scrollableDiv {
10  width: 200px;
11  height: 200px;
12  overflow: scroll;
13}
14
15#innerDiv {
16  width: 400px;
17  height: 400px;
18}
19</style>
20
21<body style="margin:0" onload=runTest()>
22<div id="scrollableDiv">
23  <div id="innerDiv">
24  </div>
25</div>
26</body>
27
28<script>
29var scrolling_div = document.getElementById('scrollableDiv');
30var overscrolled_x_delta = 0;
31var overscrolled_y_delta = 0;
32function onOverscroll(event) {
33  assert_false(event.cancelable);
34  assert_false(event.bubbles);
35  overscrolled_x_delta = event.deltaX;
36  overscrolled_y_delta = event.deltaY;
37}
38scrolling_div.addEventListener("overscroll", onOverscroll);
39
40function runTest() {
41  promise_test (async (t) => {
42    // Make sure that no overscroll event is sent to document.
43    document.addEventListener("overscroll",
44        t.unreached_func("Document got unexpected overscroll event."));
45    await waitForCompositorCommit();
46
47    // Do a horizontal scroll and wait for overscroll event.
48    await touchScrollInTarget(300, scrolling_div , 'right');
49    await waitFor(() => { return overscrolled_x_delta > 0; },
50        'Scroller did not receive overscroll event after horizontal scroll.');
51    assert_equals(scrolling_div.scrollWidth - scrolling_div.scrollLeft,
52                scrolling_div.clientWidth);
53
54    overscrolled_x_delta = 0;
55    overscrolled_y_delta = 0;
56
57    // Do a vertical scroll and wait for overscroll event.
58    await touchScrollInTarget(300, scrolling_div, 'down');
59    await waitFor(() => { return overscrolled_y_delta > 0; },
60        'Scroller did not receive overscroll event after vertical scroll.');
61    assert_equals(scrolling_div.scrollHeight - scrolling_div.scrollTop,
62                scrolling_div.clientHeight);
63  }, 'Tests that the scrolled element gets overscroll event after fully scrolling by touch.');
64}
65</script>
66