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<!DOCTYPE html>
<title>Animated anchor transform in iframe</title>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#determining-position">
<iframe id="iframe" style="width:300px; height:400px;" srcdoc='
<style>
#anchor {
anchor-name: --a;
width: 200px;
height: 200px;
translate: 0;
background: hotpink;
}
#anchored {
position: absolute;
position-anchor: --a;
position-area: bottom right;
width: 100%;
height: 100%;
background: cyan;
}
@keyframes anim {
from { translate: 0; }
to { translate: 100px; }
}
body { margin: 0; }
</style>
<div id="anchor"></div>
<div id="anchored"></div>
<script>
const done = Promise.withResolvers();
let got_halfway = false;
const observer = new ResizeObserver((entries)=> {
const inlineSize = entries[0].contentBoxSize[0].inlineSize;
if (inlineSize > 30 && inlineSize < 90) {
got_halfway = true;
done.resolve();
}
});
anchor.onanimationend = ()=> { done.reject(); }
async function runTest() {
await new Promise(resolve => { window.onmessage = resolve; });
anchor.style.animation = "2000ms linear anim";
try {
observer.observe(anchored);
await done.promise;
observer.unobserve(anchored);
anchor.style.animation = "none";
} catch (e) {}
window.top.postMessage(got_halfway);
}
runTest();
</script>
'></iframe>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
promise_test(async t => {
await new Promise(resolve => { window.onload = resolve; });
iframe.contentWindow.postMessage("go");
let success = await new Promise(resolve => {
window.onmessage = function(e) { resolve(e.data); };
});
assert_true(success, "animation frame somewhere in the middle");
}, "Animation being updated");
</script>
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