<!DOCTYPE html>
<title>Tests `anchor` function when anchor positions are changed dynamically</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#propdef-anchor-name">
<link rel="author" href="mailto:[email protected]">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<script src="support/test-common.js"></script>
<style>
#container {
position: relative;
}
#a1 {
anchor-name: --a1;
background: orange;
margin-left: 100px;
margin-top: 100px;
width: 50px;
height: 50px;
}
.after #a1 {
width: 100px;
height: 100px;
}
#a2 {
anchor-name: --a2;
background: purple;
margin-left: 250px;
margin-top: 350px;
width: 100px;
height: 100px;
}
.after #a2 {
margin-left: 500px;
margin-top: 100px;
}
#target {
background: green;
position: absolute;
left: anchor(--a1 right);
top: anchor(--a1 bottom);
right: anchor(--a2 left);
bottom: anchor(--a2 top);
}
#ref {
background: red;
position: absolute;
left: 200px;
top: 100px;
width: 300px;
height: 100px;
}
</style>
<body>
<div id="container">
<div id="a1"></div>
<div id="a2"></div>
<div id="ref"></div>
<div id="target"
data-offset-x=200 data-offset-y=100
data-expected-width=300 data-expected-height=100></div>
</div>
<script type="module">
document.body.offsetTop; // Force layout.
container.classList.add('after');
await checkLayoutForAnchorPos('#target');
</script>
</body>
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