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<!DOCTYPE html>
<title>Tests CSS transition of anchor() and anchor-size() functions</title>
<link rel="help" href="https://drafts4.csswg.org/css-anchor-position-1/">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/8180"></script>
<link rel="author" href="mailto:xiaochengh@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body {
margin: 0;
}
#anchor1 {
margin-left: 0px;
margin-top: 0px;
width: 200px;
height: 100px;
background: orange;
anchor-name: --a1;
}
#anchor2 {
margin-left: 400px;
margin-top: 200px;
width: 100px;
height: 200px;
background: orange;
anchor-name: --a2;
}
#target {
position: fixed;
width: 100px;
height: 100px;
background-color: lime;
transition: all 10s -5s linear;
}
#target.before {
top: anchor(--a1 top);
left: anchor(--a1 right);
width: anchor-size(--a1 width);
height: anchor-size(--a1 height);
}
#target.after {
top: anchor(--a2 bottom);
left: anchor(--a2 left);
width: anchor-size(--a2 width);
height: anchor-size(--a2 height);
}
</style>
<div id="anchor1"></div>
<div id="anchor2"></div>
<div id="target" class="before"></div>
<script>
setup(() => {
// Forces layout
target.offsetLeft;
// Triggers transition starting at 50% immediately
target.classList.remove('before');
target.classList.add('after');
});
test(() => {
assert_equals(target.offsetLeft, 300);
assert_equals(target.offsetTop, 250);
}, 'Transition of anchor() when changing target anchor element name');
test(() => {
assert_equals(target.offsetWidth, 150);
assert_equals(target.offsetHeight, 150);
}, 'Transition of anchor-size() when changing target anchor element name');
</script>
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