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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
<title>Smooth anchor scroll in snap container works</title>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap/"/>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
</head>
<body>
<style>
div {
scroll-behavior: smooth;
}
.scroller {
height: 200px;
width: 200px;
overflow-x: scroll;
scroll-snap-type: x mandatory;
border: solid 1px black;
background-color: yellow;
position: relative;
}
.snaparea {
height: 50px;
width: 50px;
scroll-snap-align: start;
background-color: green;
}
#target {
height: 50px;
width: 50px;
background-color: green;
}
.space {
height: 200vh;
width: 200vw;
}
</style>
<div class="scroller" id="scroller">
<div class="snaparea"><a id="link" href="#target">target</a></div>
<div class="space"></div>
<div id="target"></div>
</div>
<script>
window.onload = () => {
promise_test(async (t) => {
await waitForCompositorCommit();
const scroller = document.getElementById("scroller");
const link = document.getElementById("link");
const scrollend_promise = waitForScrollendEventNoTimeout(scroller);
link.click();
await scrollend_promise;
assert_equals(scroller.scrollTop,
scroller.scrollHeight - scroller.clientHeight);
}, "smooth scroll to anchor link target in snap container works.");
}
</script>
</body>
</html>
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