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<!DOCTYPE html>
<title>CSS Container Query Test: named style container query change with inherited custom property</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#container-rule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
#container {
container-name: container;
}
.match {
--match: true;
}
#inner {
color: red;
}
@container container style(--match: true) {
#inner {
color: green;
}
}
</style>
<div id="container">
<div id="outer">
<div id="inner"></div>
</div>
</div>
<script>
setup(() => assert_implements_container_queries());
test(() => {
assert_equals(getComputedStyle(inner).color, "rgb(255, 0, 0)");
assert_equals(getComputedStyle(inner).getPropertyValue("--match"), "");
assert_equals(getComputedStyle(outer).getPropertyValue("--match"), "");
assert_equals(getComputedStyle(container).getPropertyValue("--match"), "");
}, "Pre-conditions");
test(() => {
container.className = "match";
assert_equals(getComputedStyle(inner).color, "rgb(0, 128, 0)");
assert_equals(getComputedStyle(inner).getPropertyValue("--match"), "true");
assert_equals(getComputedStyle(outer).getPropertyValue("--match"), "true");
assert_equals(getComputedStyle(container).getPropertyValue("--match"), "true");
}, "Changed --match inherits down descendants and affects container query");
</script>
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