wpt/css/css-anchor-position/anchor-function-pseudo-element-basic.html at 71663448bfcaabc177533e4d6ce0dfd743aed6bd · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<title>Positioning pseudo-elements using anchor functions</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#positioning">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body { margin: 0 }
#anchor, #target::before, #target::after {
    width: 100px;
    height: 100px;
    position: absolute;
}
#anchor.moved {
    left: 200px;
    top: 200px;
}
#anchor {
    left: 50px;
    top: 100px;
    anchor-name: --a;
    background: blue;
}
#target::before {
    position-anchor: --a;
    left: anchor(right);
    top: anchor(top);
    background: green;
    content:'';
}
#target::after {
    position-anchor: --a;
    left: anchor(left);
    top: anchor(bottom);
    background: green;
    content:'';
}
</style>
<div id=anchor></div>
<div id=target></div>
<script>
test(() => {
    assert_equals(getComputedStyle(target, '::before').top, '100px', "#target::before top is positioned against anchor");
    assert_equals(getComputedStyle(target, '::before').left, '150px', "#target::before left is positioned against anchor");
    assert_equals(getComputedStyle(target, '::after').top, '200px', "#target::after top is positioned against anchor");
    assert_equals(getComputedStyle(target, '::after').left, '50px', "#target::after left is positioned against anchor");
}, "Initial anchored position");

test(() => {
    anchor.classList.add("moved");
    assert_equals(getComputedStyle(target, '::before').top, '200px', "#target::before top is positioned against anchor");
    assert_equals(getComputedStyle(target, '::before').left, '300px', "#target::before left is positioned against anchor");
    assert_equals(getComputedStyle(target, '::after').top, '300px', "#target::after top is positioned against anchor");
    assert_equals(getComputedStyle(target, '::after').left, '200px', "#target::after left is positioned against anchor");
}, "Anchored position after moving");
</script>