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<!doctype html>
<meta charset="utf-8">
<title>CSS Container Queries Test: Tree scoped container-name</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#query-container">
<link rel="help" href="https://drafts.csswg.org/css-scoping-1/#shadow-names">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/declarative-shadow-dom-polyfill.js"></script>
<script src="support/cq-testcommon.js"></script>
<div id="container-name-host">
<div>
<template shadowroot="open">
<style>
:host { container-name: foo; }
</style>
<slot></slot>
</template>
<div id="t1"></div>
</div>
<style>
#container-name-host > div {
container-type: inline-size;
}
#t1 { color: green; }
@container foo (width > 0px) {
#t1 { color: red; }
}
</style>
</div>
<div id="container-name-slotted">
<div>
<template shadowroot="open">
<style>
::slotted(div) {
container-name: foo;
}
</style>
<slot></slot>
</template>
<div>
<div id="t2"></div>
</div>
</div>
<style>
#container-name-slotted > div > div {
container-type: inline-size;
}
#t2 { color: green; }
@container foo (width > 0px) {
#t2 { color: red; }
}
</style>
</div>
<script>
setup(() => {
assert_implements_container_queries();
polyfill_declarative_shadow_dom(document);
});
const green = "rgb(0, 128, 0)";
test(() => {
assert_equals(getComputedStyle(t1).color, green);
}, "Outer scope query should not match container-name set by :host rule in shadow tree");
test(() => {
assert_equals(getComputedStyle(t2).color, green);
}, "Outer scope query should not match container-name set by ::slotted rule in shadow tree");
</script>
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