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<!DOCTYPE html>
<title>Container Relative Units: container relative units fall back to small viewport</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: 320px;
}
</style>
<iframe id=iframe srcdoc="
<style>
#parent {
container-type: inline-size;
width: 64px;
height: 50px;
}
#container {
container-type: size;
width: 32px;
height: 32px;
}
#target1, #target2 { color: green; }
/* Unit should evaluate against width of #parent */
@container ((height = 32px) and (height = 50cqw)) {
#target1 { color: blue; }
}
/* Unit should evaluate against height of iframe */
@container ((height = 32px) and (height = 10cqh)) {
#target2 { color: blue; }
}
</style>
<div id=parent>
<div id=container>
<div id=target1></div>
<div id=target2></div>
</div>
</div>
"></iframe>
<script>
setup(() => assert_implements_container_queries());
function waitForLoad(w) {
return new Promise(resolve => w.addEventListener('load', resolve));
}
promise_test(async () => {
await waitForLoad(window);
let inner_target1 = iframe.contentDocument.querySelector('#target1');
let inner_target2 = iframe.contentDocument.querySelector('#target2');
assert_equals(getComputedStyle(inner_target1).color, 'rgb(0, 0, 255)');
assert_equals(getComputedStyle(inner_target2).color, 'rgb(0, 0, 255)');
iframe.style = 'height:400px';
// #target1 is not affected since it evaluated against another container.
// #target2 *is* affected, because it evaluated against the iframe size
// which just changed.
assert_equals(getComputedStyle(inner_target1).color, 'rgb(0, 0, 255)');
assert_equals(getComputedStyle(inner_target2).color, 'rgb(0, 128, 0)');
}, 'Use small viewport size as fallback');
</script>
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