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<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body {
margin: 0px;
height: 2000px;
width: 2000px;
}
#first {
height: 1000px;
background-color: #FFA5D2;
}
#anchor {
position: absolute;
background-color: #84BE6A;
height: 600px;
width: 100%;
}
#fragment {
position: relative;
background-color: orange;
height: 200px;
width: 200px;
margin: 10px;
}
</style>
<div id="first"></div>
<div id="changer"></div>
<div id="anchor">
<div id="fragment" name="fragment"></div>
</div>
<script>
promise_test(async function(t) {
// Note that this test passes even without scroll anchoring because of
// fragment anchoring.
window.location.hash = 'fragment';
// Height of first + fragment margin-top.
assert_equals(window.scrollY, 1010);
// Change height of content above fragment.
var ch = document.getElementById('changer');
ch.style.height = 100;
await new Promise(resolve => addEventListener('scroll', resolve, {once: true}));
// Height of first + height changer + fragment margin-top.
assert_equals(window.scrollY, 1110);
first.remove();
changer.remove();
anchor.remove();
}, 'Verify scroll anchoring interaction with fragment scrolls');
</script>
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