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<!DOCTYPE html>
<html>
<head>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-type" />
<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="/dom/events/scrolling/scroll_support.js"></script>
</head>
<body>
<style>
#scroller {
width: 200px;
height: 400px;
overflow-y: scroll;
scroll-snap-type: y mandatory;
background-color: blue;
}
#snap_target {
width: 100px;
height: 1942.5px;
scroll-snap-align: start;
background-color: pink;
}
</style>
<div id="scroller">
<div id="snap_target"></div>
</div>
<script>
promise_test(async (t) => {
await waitForCompositorCommit();
let scrollend_promise = new Promise((resolve) => {
scroller.addEventListener("scrollend", resolve);
});
let scroll_promise = new Promise((resolve) => {
scroller.addEventListener("scroll", resolve);
});
await new test_driver.Actions().scroll(0, 0, 0,
scroller.scrollHeight, { origin: scroller }).send();
await scroll_promise;
await scrollend_promise;
assert_approx_equals(scroller.scrollTop,
scroller.scrollHeight - scroller.clientHeight, 1,
"scroller is scrolled to its bottom and not its top.");
}, "snapport covered by snap area doesn't jump");
</script>
</body>
</html>
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