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<!doctype html>
<title>Container Relative Units: Advanced Container Selection</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>
* { writing-mode: initial; }
.inline { container-type: inline-size; }
.size { container-type: size; }
.vertical { writing-mode: vertical-rl; }
.w500 { width: 500px; }
.h400 { height: 400px; }
.w300 { width: 300px; }
.h200 { height: 200px; }
.w100 { width: 100px; }
</style>
<div id=ref></div>
<div id=c1>
<div id=c2>
<div id=c3>
<div id=c4>
<div id=child>Test</div>
</div>
</div>
</div>
</div>
<script>
setup(() => assert_implements_container_queries());
function assert_unit_equals(element, actual, expected) {
try {
element.style.padding = actual;
ref.style.padding = expected;
assert_equals(getComputedStyle(element).paddingLeft,
getComputedStyle(ref).paddingLeft);
} finally {
element.style = '';
ref.style = '';
}
}
test(() => {
try {
c1.className = 'inline w500'; // Selected by nothing.
c2.className = 'size h400 w300'; // Selected by cqh, cqb.
c3.className = 'inline w100'; // Selected by cqw, cqi.
assert_unit_equals(child, '10cqw', '10px');
assert_unit_equals(child, '10cqi', '10px');
assert_unit_equals(child, '10cqh', '40px');
assert_unit_equals(child, '10cqb', '40px');
assert_unit_equals(child, '10cqmin', '10px');
assert_unit_equals(child, '10cqmax', '40px');
c3.className = ''; // cqw, cqi now selects c2 instead.
assert_unit_equals(child, '10cqw', '30px');
assert_unit_equals(child, '10cqi', '30px');
assert_unit_equals(child, '10cqh', '40px');
assert_unit_equals(child, '10cqb', '40px');
assert_unit_equals(child, '10cqmin', '30px');
assert_unit_equals(child, '10cqmax', '40px');
} finally {
for (let c of [c1, c2, c3, c4, child])
c.className = '';
}
}, 'Container units select the proper container');
test(() => {
try {
c1.className = 'size w500 h400';
c2.className = 'inline w300 h200';
// [cqi, cqb] corresponds to [cqw, cqh].
assert_unit_equals(child, '10cqw', '30px');
assert_unit_equals(child, '10cqi', '30px');
assert_unit_equals(child, '10cqh', '40px');
assert_unit_equals(child, '10cqb', '40px');
child.className = 'vertical';
// [cqi, cqb] now corresponds to [cqh, cqw].
assert_unit_equals(child, '10cqw', '30px');
assert_unit_equals(child, '10cqi', '40px');
assert_unit_equals(child, '10cqh', '40px');
assert_unit_equals(child, '10cqb', '30px');
c2.classList.add('vertical');
// The inline containment on #c2 now applies to the vertical axis.
// [cqi, cqb] still corresponds to [cqh, cqw], but we now expect
// cqh to resolve against #c2, and cqw to resolve against #c1.
assert_unit_equals(child, '10cqw', '50px');
assert_unit_equals(child, '10cqi', '20px');
assert_unit_equals(child, '10cqh', '20px');
assert_unit_equals(child, '10cqb', '50px');
} finally {
for (let c of [c1, c2, c3, c4, child])
c.className = '';
}
}, 'Units respond to the writing-mode of the element');
</script>
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