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<!DOCTYPE html>
<title>Implicit anchor element for pseudo-elements using anchor functions</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#implicit">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body { margin: 0 }
#target {
margin-top: 100px;
margin-left: 50px;
width: 100px;
height: 100px;
background: blue;
}
#target::before, #target::after {
width: 100px;
height: 100px;
position: absolute;
position-anchor: auto;
}
#target.moved {
margin-top: 200px;
margin-left: 200px;
}
#target::before {
left: anchor(right);
top: anchor(top);
background: green;
content:'';
}
#target::after {
left: anchor(left);
top: anchor(bottom);
background: green;
content:'';
}
</style>
<div id=target></div>
<script>
test(() => {
assert_equals(getComputedStyle(target, '::before').top, '100px');
assert_equals(getComputedStyle(target, '::before').left, '150px');
assert_equals(getComputedStyle(target, '::after').top, '200px');
assert_equals(getComputedStyle(target, '::after').left, '50px');
}, "The implicit anchor element of a pseudo-element is its originating element");
test(() => {
target.classList.add("moved");
assert_equals(getComputedStyle(target, '::before').top, '200px');
assert_equals(getComputedStyle(target, '::before').left, '300px');
assert_equals(getComputedStyle(target, '::after').top, '300px');
assert_equals(getComputedStyle(target, '::after').left, '200px');
}, "Anchored position after moving");
</script>
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