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<!DOCTYPE html>
<title>Tests anchor positioned scrolling resolving name conflicts</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#scroll">
<link rel="author" href="mailto:xiaochengh@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/test-common.js"></script>
<style>
body {
margin: 0;
}
.scroller {
width: 100px;
height: 100px;
overflow-y: scroll;
}
.nonpos-cb {
transform: scale(1);
}
.abspos-cb {
position: absolute;
}
.anchor {
background: orange;
anchor-name: --a1;
position: absolute;
width: 50px;
height: 50px;
top: 50px;
}
.spacer {
height: 200px;
}
.target {
background: lime;
position: absolute;
width: 50px;
height: 50px;
top: anchor(--a1 top);
left: anchor(--a1 right);
position-anchor: --a1;
}
</style>
<div class="abspos-cb" style="width: 300px; height: 400px">
<div class="scroller nonpos-cb" id="scroller1">
<div class="anchor" id="anchor1"></div>
<div class="spacer"></div>
</div>
<div class="target" id="target1"></div>
<div class="scroller abspos-cb" style="top: 125px" id="scroller2">
<div class="anchor" id="anchor2"></div>
<div class="spacer"></div>
</div>
<div class="target" id="target2"></div>
<div class="scroller abspos-cb" style="top: 250px" id="scroller3">
<div class="anchor" id="anchor3"></div>
<div class="spacer"></div>
</div>
<div class="target" id="target3"></div>
</div>
<script>
promise_test(async () => {
scroller1.scrollTop = 10;
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_equals(target1.getBoundingClientRect().top, anchor1.getBoundingClientRect().top);
assert_equals(target1.getBoundingClientRect().top, 40);
}, 'target1 should scroll with anchor1');
promise_test(async () => {
scroller2.scrollTop = 20;
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_equals(target2.getBoundingClientRect().top, anchor2.getBoundingClientRect().top);
assert_equals(target2.getBoundingClientRect().top, 155);
}, 'target2 should scroll with anchor2');
promise_test(async () => {
scroller3.scrollTop = 30;
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_equals(target3.getBoundingClientRect().top, anchor3.getBoundingClientRect().top);
assert_equals(target3.getBoundingClientRect().top, 270);
}, 'target3 should scroll with anchor3');
</script>
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