<!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>
#overscrollXDiv {
width: 600px;
height: 600px;
overflow: scroll;
overscroll-behavior-x: contain;
}
#overscrollYDiv {
width: 500px;
height: 500px;
overflow: scroll;
overscroll-behavior-y: none;
}
#targetDiv {
width: 400px;
height: 400px;
overflow: scroll;
}
.content {
width:800px;
height:800px;
}
</style>
<body style="margin:0" onload=runTest()>
<div id="overscrollXDiv">
<div class=content>
<div id="overscrollYDiv">
<div class=content>
<div id="targetDiv">
<div class="content">
</div>
</div>
</div>
</div>
</div>
</div>
</body>
<script>
var target_div = document.getElementById('targetDiv');
var overscrolled_x_delta = 0;
var overscrolled_y_delta = 0;
function onOverscrollX(event) {
assert_false(event.cancelable);
assert_false(event.bubbles);
overscrolled_x_delta = event.deltaX;
}
function onOverscrollY(event) {
assert_false(event.cancelable);
assert_false(event.bubbles);
overscrolled_y_delta = event.deltaY;
}
// Test that both "onoverscroll" and addEventListener("overscroll"... work.
document.getElementById('overscrollXDiv').onoverscroll = onOverscrollX;
document.getElementById('overscrollYDiv').
addEventListener("overscroll", onOverscrollY);
function runTest() {
promise_test (async (t) => {
// Make sure that no overscroll event is sent to document or target_div.
document.addEventListener("overscroll",
t.unreached_func("Document got unexpected overscroll event."));
target_div.addEventListener("overscroll",
t.unreached_func("target_div got unexpected overscroll event."));
await waitForCompositorCommit();
// Scroll up on target div and wait for the element with overscroll-y to get
// overscroll event.
await touchScrollInTarget(300, target_div, 'up');
await waitFor(() => { return overscrolled_y_delta < 0; },
'Expected element did not receive overscroll event after scroll up on ' +
'target.');
assert_equals(target_div.scrollTop, 0);
// Scroll left on target div and wait for the element with overscroll-x to
// get overscroll event.
await touchScrollInTarget(300, target_div, 'left');
await waitFor(() => { return overscrolled_x_delta < 0; },
'Expected element did not receive overscroll event after scroll left ' +
'on target.');
assert_equals(target_div.scrollLeft, 0);
}, 'Tests that the last element in the cut scroll chain gets overscroll ' +
'event when no element scrolls by touch.');
}
</script>
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