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<!DOCTYPE html>
<title>CSS Anchor Positioning: Transition when the result of anchor()/anchor-size() changes</title>
<link rel="help" href="https://drafts4.csswg.org/css-anchor-position-1/">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/9598">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.cb {
display: inline-block;
position: relative;
width: 250px;
height: 250px;
border: 1px solid black;
}
.anchor {
position: absolute;
width: 50px;
height: 40px;
left: 60px;
top: 40px;
background: coral;
anchor-name: --a;
}
.shift {
left: 80px;
}
.grow {
width: 70px;
}
.anchored {
position: absolute;
width: anchor-size(width);
height: 40px;
position-anchor: --a;
top: anchor(bottom);
left: anchor(right);
transition-duration: 1000s;
transition-timing-function: steps(2, start);
background-color: skyblue;
}
</style>
<div id=anchor_test class=cb>
<div class=anchor></div>
<div class=anchored style="transition-property:left"></div>
</div>
<script>
test(() => {
let anchor = anchor_test.querySelector('.anchor');
let anchored = anchor_test.querySelector('.anchored');
assert_equals(anchored.offsetLeft, 110);
anchor.classList.add('shift');
assert_equals(anchored.offsetLeft, 120);
}, 'Transition when the result of anchor() changes');
</script>
<div id=anchor_size_test class=cb>
<div class=anchor></div>
<div class=anchored style="transition-property:width"></div>
</div>
<script>
test(() => {
let anchor = anchor_size_test.querySelector('.anchor');
let anchored = anchor_size_test.querySelector('.anchored');
assert_equals(anchored.offsetWidth, 50);
anchor.classList.add('grow');
assert_equals(anchored.offsetWidth, 60);
}, 'Transition when the result of anchor-size() changes');
</script>
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