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<!DOCTYPE html>
<html>
<head>
<title>
<title> CSS Scroll Snap 2 Test: snapchanged events on proximity strictness container</title>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#snap-events"/>
</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
<script src="/css/css-scroll-snap-2/resources/common.js"></script>
<style>
div {
position: absolute;
margin: 0;
}
#scroller {
height: 600px;
width: 600px;
overflow: hidden;
scroll-snap-type: y proximity;
}
.snap {
width: 300px;
height: 300px;
background-color: green;
scroll-snap-align: start;
}
.area {
width: 2000px;
height: 2000px;
}
</style>
</head>
<body>
<div id="scroller">
<div class="area"></div>
<div id="target" class="snap" style="top: 0px;"></div>
</div>
<script>
const target = document.getElementById("target");
let resolve_func = null;
promise_test(async (test) => {
checkSnapEventSupport("snapchanged");
await waitForCompositorCommit();
// The initial snap position is at (0, 0).
assert_equals(scroller.scrollTop, 0);
assert_equals(scroller.scrollLeft, 0);
let snapchanged_promise = waitForSnapChangedEvent(scroller);
// Scroll to a position where it's outside of the scroll-snap proximity
// threshold, so that it won't trigger snapping.
scroller.scrollTo(0, 250);
// snapchanged should fire as we've moved from within the proximity range
// to outside the proximity range and are no longer snapped.
let evt = await snapchanged_promise;
assert_equals(scroller.scrollTop, 250);
assertSnapEventDeprecated(evt, []);
evt = null;
snapchanged_promise = waitForSnapChangedEvent(scroller);
// Scroll to a position within the scroll-snap proximity
// threshold, so that it triggers snapping.
scroller.scrollTo(0, 190);
evt = await snapchanged_promise;
assert_equals(scroller.scrollTop, 0);
// snapchanged should fire as we've moved from outside the proximity range
// to inside the proximity range and are once again snapped.
assertSnapEventDeprecated(evt, [target.id]);
}, "Snapchanged fires when scrolling outside proximity range.");
</script>
</body>
</html>
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