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<!DOCTYPE html>
<title>Container-relative units in @media</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#container-lengths">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
iframe {
width: 200px;
height: 100px;
}
</style>
<iframe id=iframe></iframe>
<script>
setup(() => assert_implements_container_queries());
const doc = iframe.contentDocument;
const win = iframe.contentWindow;
function test_media_query(feature, result, description) {
test((t) => {
t.add_cleanup(() => { doc.body.innerHTML = ''; })
doc.body.innerHTML = `
<style>
body {
color: red;
}
@media (${feature}) {
body {
color: green;
}
}
</style>
`;
assert_equals(win.getComputedStyle(doc.body).color, result);
}, description);
}
function test_media_query_applies(feature) {
test_media_query(feature, 'rgb(0, 128, 0)', `@media(${feature}) applies`);
}
function test_media_query_does_not_apply(feature) {
test_media_query(feature, 'rgb(255, 0, 0)', `@media(${feature}) does not apply`);
}
// Container-relative units resolve against the "small viewport size" for
// media queries.
test_media_query_applies('width:100cqw');
test_media_query_applies('width:100cqi');
test_media_query_applies('width:100cqmax');
test_media_query_applies('height:100cqh');
test_media_query_applies('height:100cqb');
test_media_query_applies('height:100cqmin');
test_media_query_does_not_apply('width:90cqw');
test_media_query_does_not_apply('height:90cqh');
</script>
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