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Test Info:

<!DOCTYPE html>
<title>CSS Container Queries Test: calc()</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
:root { font-size: 10px; }
/* To make output more readable */
:root > * { font-size: initial; }
#container {
container-type: size;
width: 200px;
height: 50px;
}
@container (width = calc(100px + 10rem)) {
#target { color: green; }
}
</style>
<div id=container>
<div id=target></div>
</div>
<script>
setup(() => assert_implements_size_container_queries());
test(() => {
assert_equals(getComputedStyle(target).color, 'rgb(0, 128, 0)');
}, 'em relative inline-size');
</script>