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<!DOCTYPE HTML>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="scroll_support.js"></script>
<style>
#scrollableDiv {
width: 200px;
height: 200px;
overflow: scroll;
}
#innerDiv {
width: 400px;
height: 400px;
}
</style>
<body style="margin:0" onload=runTest()>
<div id="scrollableDiv">
<div id="innerDiv">
</div>
</div>
</body>
<script>
var scrolling_div = document.getElementById('scrollableDiv');
var overscrolled_x_delta = 0;
var overscrolled_y_delta = 0;
function onOverscroll(event) {
assert_false(event.cancelable);
assert_false(event.bubbles);
overscrolled_x_delta = event.deltaX;
overscrolled_y_delta = event.deltaY;
}
scrolling_div.addEventListener("overscroll", onOverscroll);
function runTest() {
promise_test (async (t) => {
// Make sure that no overscroll event is sent to document.
document.addEventListener("overscroll",
t.unreached_func("Document got unexpected overscroll event."));
await waitForCompositorCommit();
// Do a horizontal scroll and wait for overscroll event.
await touchScrollInTarget(300, scrolling_div , 'right');
await waitFor(() => { return overscrolled_x_delta > 0; },
'Scroller did not receive overscroll event after horizontal scroll.');
assert_equals(scrolling_div.scrollWidth - scrolling_div.scrollLeft,
scrolling_div.clientWidth);
overscrolled_x_delta = 0;
overscrolled_y_delta = 0;
// Do a vertical scroll and wait for overscroll event.
await touchScrollInTarget(300, scrolling_div, 'down');
await waitFor(() => { return overscrolled_y_delta > 0; },
'Scroller did not receive overscroll event after vertical scroll.');
assert_equals(scrolling_div.scrollHeight - scrolling_div.scrollTop,
scrolling_div.clientHeight);
}, 'Tests that the scrolled element gets overscroll event after fully scrolling by touch.');
}
</script>
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