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<!doctype html>
<title>Container Queries - Animating container size</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#animated-containers">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
@keyframes anim {
from { width: 200px; }
to { width: 100px; }
}
#container {
container-type: inline-size;
animation: anim 1s linear paused;
}
#target {
background-color: green;
}
@container (width: 200px) {
#target {
background-color: blue;
}
}
</style>
<div id=container>
<div id=target>
Test
</div>
</div>
<script>
setup(() => assert_implements_container_queries());
test(() => {
assert_equals(getComputedStyle(target).backgroundColor, 'rgb(0, 0, 255)');
assert_equals(container.getAnimations().length, 1);
let animation = container.getAnimations()[0];
animation.currentTime = 500;
assert_equals(getComputedStyle(target).backgroundColor, 'rgb(0, 128, 0)');
}, 'Animation affects container query evaluation');
</script>
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