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<!doctype html>
<meta charset="utf-8">
<title>CSS Container Queries Test: Invalidate size container query for Shadow DOM</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#query-container">
<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>
<style>
.container {
container-type: inline-size;
width: 100px;
}
@container (width = 200px) {
.target { color: green; }
}
</style>
<div id="host_container" class="container">
<template shadowrootmode="open">
<div class="container">
<slot></slot>
</div>
</template>
<div class="target">Green</div>
</div>
<div id="non_host_container" class="container">
<div>
<template shadowrootmode="open">
<div class="container">
<slot></slot>
</div>
</template>
<div class="target">Green</div>
</div>
</div>
<script>
setup(() => {
assert_implements_container_queries();
polyfill_declarative_shadow_dom(document);
});
const green = "rgb(0, 128, 0)";
test(() => {
document.body.offsetTop;
host_container.style.width = "200px";
assert_equals(getComputedStyle(document.querySelector("#host_container .target")).color, green);
}, "Host container child invalidated with container in shadow tree");
test(() => {
document.body.offsetTop;
non_host_container.style.width = "200px";
assert_equals(getComputedStyle(document.querySelector("#non_host_container .target")).color, green);
}, "Non-host container child invalidated with container in shadow tree");
</script>
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