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<!DOCTYPE html>
<title>Tests that layout is updated on anchor-default value changes</title>
<link rel="help" href="https://drafts4.csswg.org/css-anchor-position-1/#anchor-default">
<link rel="author" href="mailto:xiaochengh@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#target {
position: fixed;
width: 100px;
height: 100px;
background: lime;
top: anchor(top);
left: anchor(right);
anchor-default: --a;
}
#target.after {
anchor-default: --b;
}
#anchor1, #anchor2 {
width: 100px;
height: 100px;
background: orange;
}
#anchor1 {
anchor-name: --a;
}
#anchor2 {
margin-left: 100px;
anchor-name: --b;
}
body {
margin: 0;
}
</style>
<div id="anchor1"></div>
<div id="anchor2"></div>
<div id="target"></div>
<script>
test(() => {
document.body.offsetLeft; // Force layout
target.classList.add('after');
// #target should be anchored to #anchor2 now
assert_equals(target.offsetLeft, 200);
assert_equals(target.offsetTop, 100);
}, 'Layout is updated on `anchor-default` changes');
</script>
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