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<!doctype html>
<title>CSS Container Queries Test: Nested top layer elements and @container</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#container-queries">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
dialog { color: red; }
#container { width: 100px; }
#container, #outer { container-type: inline-size; }
@container (min-width: 200px) {
#outer { width: 400px; color: lime; }
}
@container (min-width: 400px) {
#inner { color: green; }
}
</style>
<div id="container">
<dialog id="outer">
<dialog id="inner"></dialog>
</dialog>
</div>
<script>
setup(() => assert_implements_container_queries());
test(() => {
assert_equals(getComputedStyle(outer).color, "rgb(255, 0, 0)");
assert_equals(getComputedStyle(inner).color, "rgb(255, 0, 0)");
}, "Dialogs initially not matching for container queries");
test(() => {
container.offsetTop;
outer.showModal();
inner.showModal();
assert_equals(getComputedStyle(outer).color, "rgb(255, 0, 0)");
assert_equals(getComputedStyle(inner).color, "rgb(255, 0, 0)");
}, "Dialogs still not matching after showModal");
test(() => {
container.offsetTop;
container.style.width = "200px";
assert_equals(getComputedStyle(outer).color, "rgb(0, 255, 0)");
assert_equals(getComputedStyle(inner).color, "rgb(0, 128, 0)");
}, "@container queries start matching");
</script>
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