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<!doctype html>
<title>@container-dependent elements respond to container size changes</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#size-container">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
#container {
container-type: size;
width: 200px;
height: 50px;
}
div { color: red; }
@container (min-width: 300px) {
div { color: green; }
}
</style>
<main id=container>
<div id=child>
Test
<p><span id=descendant>Deep</span></p>
</div>
</main>
<script>
setup(() => assert_implements_container_queries());
test(function() {
assert_equals(getComputedStyle(child).color, 'rgb(255, 0, 0)');
container.style.width = '300px';
assert_equals(getComputedStyle(child).color, 'rgb(0, 128, 0)');
}, 'Children respond to changes in container size');
test(function() {
container.style = '';
assert_equals(getComputedStyle(descendant).color, 'rgb(255, 0, 0)');
container.style.width = '300px';
assert_equals(getComputedStyle(descendant).color, 'rgb(0, 128, 0)');
}, 'Descendants respond to changes in container size');
</script>
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