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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> CSS Scroll Snap 2 Test: snapchanged events</title>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#snap-events">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
</head>
<body>
<style>
#container {
overflow-y: scroll;
height: 500px;
width: 300px;
border: solid 1px black;
position: absolute;
scroll-snap-type: y mandatory;
}
.snap_area {
scroll-snap-align: start;
height: 400px;
width: 200px;
left: 50px;
position: absolute;
}
#area1 {
background-color: blue;
}
#area2 {
top: 400px;
background-color: yellow;
}
#area3 {
top: 800px;
background-color: green;
}
</style>
<div id="container">
<div id="area1" class="snap_area"></div>
<div id="area2" class="snap_area"></div>
<div id="area3" class="snap_area"></div>
</div>
<script>
promise_test(async (t) => {
await waitForCompositorCommit();
container.addEventListener("snapchanged",
t.unreached_func("snapchanged should not fire"));
let reset = () => {
container.scrollTo({ top: 0, behavior: "smooth"});
container.removeEventListener("scroll", reset);
};
container.addEventListener("scroll", reset);
let scrollend_promise = waitForScrollendEventNoTimeout(container);
container.scrollTo({ top: 250, behavior: "smooth"});
await scrollend_promise;
assert_equals(container.scrollTop, 0, "scroll position is reset");
// snapchanged should not fire since the scroll ended on the same snap
// target as the one it started on.
await waitForCompositorCommit();
}, "snapchanged doesn't fire if interrupting scroll cancels snap");
</script>
</body>
</html>
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