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Test Info:

<!DOCTYPE html>
<title>CSS Container Queries Test: </title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
#container { --foo: bar; }
@container style(--foo: var(--foo)) {
#target { color: green; }
}
</style>
<div id="container">
<div id="target">Should be green</div>
</div>
<script>
setup(() => assert_implements_style_container_queries());
test(() => {
assert_equals(getComputedStyle(target).color, "rgb(0, 128, 0)");
}, "style(--foo: var(--foo)) should match");
</script>