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<!doctype html>
<title>Container Queries - Animated container with inner transition</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 outer {
from { width: 100px; }
to { width: 300px; }
}
#container {
container-type: inline-size;
animation: outer 1s linear paused;
}
#target {
background-color: rgb(100, 100, 100);
}
@container (min-width: 200px) {
#target {
transition: background-color 100s steps(2, start);
background-color: rgb(200, 200, 200);
}
}
</style>
<div id=container>
<div id=target>
Test
</div>
</div>
<script>
setup(() => assert_implements_container_queries());
test(() => {
assert_equals(getComputedStyle(target).backgroundColor, 'rgb(100, 100, 100)');
assert_equals(container.getAnimations().length, 1);
let animation = container.getAnimations()[0];
animation.currentTime = 600;
assert_equals(getComputedStyle(target).backgroundColor, 'rgb(150, 150, 150)');
}, 'Animated container size triggers transition');
</script>
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