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Test Info:

<!DOCTYPE html>
<link rel="author" title="Kiet Ho" mailto="mailto:kiet.ho@apple.com">
<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>
body { margin: 0px; }
.containing-block {
position: fixed;
width: 200px;
height: 200px;
}
#anchor {
left: 100px;
width: 100px;
height: 100px;
background-color: magenta;
anchor-name: --anchor;
position: absolute;
}
#anchored {
width: 100px;
height: 100px;
background-color: green;
position: fixed;
left: anchor(--anchor left);
top: anchor(--anchor bottom);
}
</style>
<body onload="checkLayoutForAnchorPos('.target')">
<div class="containing-block">
<div id="anchor"></div>
<div id="anchored" class="target" data-offset-x="100" data-offset-y="100"></div>
</div>
</body>