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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> CSS Scroll Snap 2 Test: scrollsnapchange event on the document bubbles</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="/css/css-scroll-snap/snap-events/resources/common.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
</head>
<body>
<style>
:root {
margin: 0;
padding: 0;
scroll-snap-type: y mandatory;
}
div {
position: absolute;
margin: 0px;
}
#spacer {
width: 200vw;
height: 200vh;
}
.snap_point {
width: 40vw;
height: 40vh;
scroll-snap-align: start;
}
#snap_point_1 {
left: 0px;
top: 0px;
background-color: red;
}
#snap_point_2 {
top: 40vh;
left: 40vw;
background-color: orange;
}
#snap_point_3 {
left: 80vw;
top: 80vh;
background-color: blue;
}
</style>
<div id="spacer"></div>
<div id="snap_point_1" class="snap_point"></div>
<div id="snap_point_2" class="snap_point"></div>
<div id="snap_point_3" class="snap_point"></div>
<script>
promise_test(async(t) => {
await waitForCompositorCommit();
let scrollsnapchanging_promise = waitForSnapEvent(window, "scrollsnapchanging");
let scrollsnapchange_promise = waitForSnapEvent(window, "scrollsnapchange");
document.scrollingElement.scrollTo(0, snap_point_2.offsetTop);
let scrollsnapchanging_evt = await scrollsnapchanging_promise;
let scrollsnapchange_evt = await scrollsnapchange_promise;
assertSnapEvent(scrollsnapchanging_evt, { inline: null, block: snap_point_2 });
assertSnapEvent(scrollsnapchange_evt, { inline: null, block: snap_point_2 });
}, "scrollsnapchange bubbles when fired at the document (addEventListener).");
promise_test(async(t) => {
await waitForScrollReset(t, document.scrollingElement);
await waitForCompositorCommit();
let scrollsnapchanging_promise = waitForSnapEvent(window, "scrollsnapchanging",
/*scroll_happens=*/true,
/*use_onsnap_member=*/true);
let scrollsnapchange_promise = waitForSnapEvent(window, "scrollsnapchange",
/*scroll_happens=*/true,
/*use_onsnap_member=*/true);
document.scrollingElement.scrollTo(0, snap_point_2.offsetTop);
let scrollsnapchanging_evt = await scrollsnapchanging_promise;
let scrollsnapchange_evt = await scrollsnapchange_promise;
assertSnapEvent(scrollsnapchanging_evt, { inline: null, block: snap_point_2 });
assertSnapEvent(scrollsnapchange_evt, { inline: null, block: snap_point_2 });
}, "scrollsnapchange bubbles when fired at the document (onscrollsnapchange).");
</script>
</body>
</html>
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