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<!DOCTYPE html>
<title>Containing block size change correctly invalidates styles with anchor functions</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#anchor-pos">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.anchor, .anchored {
width: 100px;
height: 100px;
position: absolute;
}
.anchor {
left: 300px;
top: 200px;
anchor-name: --a;
background: blue;
}
.anchored {
position-anchor: --a;
right: anchor(left);
bottom: anchor(top);
background: green;
content:'';
}
.container {
position: relative;
width: 500px;
height: 500px;
border: 2px solid red;
}
.resize {
width: 400px;
height: 400px;
}
</style>
<div id=container class=container>
<div class=anchor></div>
<div>
<div id=anchored class=anchored></div>
</div>
</div>
<script>
test(() => {
assert_equals(anchored.offsetTop, 100);
assert_equals(anchored.offsetLeft, 200);
assert_equals(getComputedStyle(anchored).bottom, '300px');
assert_equals(getComputedStyle(anchored).right, '200px');
}, "Initial anchored position");
test(() => {
container.classList.add("resize");
assert_equals(anchored.offsetTop, 100);
assert_equals(anchored.offsetLeft, 200);
assert_equals(getComputedStyle(anchored).bottom, '200px');
assert_equals(getComputedStyle(anchored).right, '100px');
}, "Anchored position after resizing the containing block");
</script>
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