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<!DOCTYPE html>
<title>Tests that scroll adjustment still applies when using another anchor in default anchor's scroll container</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#needs-scroll-adjustment">
<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: 400px;
height: 400px;
overflow: scroll;
position: relative;
}
#spacer {
width: 1000px;
height: 1000px;
}
.anchor {
width: 50px;
height: 50px;
position: absolute;
background: orange;
}
#anchor1 {
anchor-name: --a1;
left: 300px;
top: 100px;
}
#anchor2 {
anchor-name: --a2;
left: 200px;
top: 200px;
}
#anchor3 {
anchor-name: --a3;
left: 100px;
top: 300px;
}
/* Uses different anchors in insets instead of the default anchor.
* Still scroll-adjusted because they are in the same scroll container. */
#target {
position: fixed;
width: 50px;
height: 50px;
left: anchor(--a3 left);
top: anchor(--a1 top);
position-anchor: --a2;
background: lime;
}
</style>
<div id="scroller">
<div id="spacer"></div>
<div class="anchor" id="anchor1"></div>
<div class="anchor" id="anchor2"></div>
<div class="anchor" id="anchor3"></div>
</div>
<div id="target"></div>
<script>
promise_test(async () => {
await waitUntilNextAnimationFrame();
assert_equals(target.getBoundingClientRect().left, 100);
assert_equals(target.getBoundingClientRect().top, 100);
scroller.scrollLeft = 50;
await waitUntilNextAnimationFrame();
assert_equals(target.getBoundingClientRect().left, 50);
scroller.scrollTop = 50;
await waitUntilNextAnimationFrame();
assert_equals(target.getBoundingClientRect().top, 50);
}, '#target3 is scroll-adjusted in both axises');
</script>
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