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<!doctype html>
<title>@container: selection using name and implicit selection</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#container-rule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
main { background-color: lightgray; }
main > div { background-color: skyblue; }
main > div > div { background-color: seagreen; }
main > div > div > div { background-color: tomato; }
main {
width: 64px;
height: 64px;
}
main div {
width: 50%;
height: 50%;
}
.inline { container-type: inline-size; }
.size { container-type: size; }
.a-inline { container: a / inline-size; }
.a-size { container: a / size; }
.b-size { container: inline- b / size; }
.b-size { container: b / size; }
.ab-size { container: a b / size; }
.a { container-name: a; contain: strict; }
</style>
<main>
<div class="inline">
<div class="size">
<span></span>
</div>
</div>
</main>
<main>
<div class="size">
<div class="inline">
<span></span>
</div>
</div>
</main>
<main>
<div class="inline">
<div class="inline">
<span></span>
</div>
</div>
</main>
<main>
<div class="a-size">
<div class="b-size">
<span></span>
</div>
</div>
</main>
<main>
<div class="a-size">
<div class="a-size">
<span></span>
</div>
</div>
</main>
<main>
<div class="a-size">
<div class="a">
<span></span>
</div>
</div>
</main>
<main>
<div class="a-size">
<div class="b-size">
<div class="a-inline">
<span></span>
</div>
</div>
</div>
</main>
<main>
<div class="a-inline">
<div class="b-size">
<span></span>
</div>
</div>
</main>
<main>
<div class="ab-size">
<div class="size">
<span></span>
</div>
</div>
</main>
<script>
setup(() => assert_implements_container_queries());
function test_query(prelude, selector, expected) {
test(t => {
let elements = document.querySelectorAll(selector);
assert_equals(elements.length, 1);
let element = elements[0];
let style = document.createElement('style');
t.add_cleanup(() => { style.remove(); });
style.innerText = `@container ${prelude} { span { --match:true; } } `;
document.body.append(style);
assert_equals(getComputedStyle(element).getPropertyValue('--match'), expected);
}, `${prelude} for ${selector}`);
}
// Test that a given container query applies to the specified element.
// The provided selector must unique identify the element.
function test_applied(prelude, selector) {
test_query(prelude, selector, 'true');
}
function test_rejected(prelude, selector) {
test_query(prelude, selector, '');
}
// For the following tests, the inner container has a size of 16x16px,
// and the outer container has a size of 32x32px.
// Implicit selection:
test_applied('(width: 16px)', '.size > .inline > span');
test_applied('(height: 16px)', '.inline > .size > span');
test_applied('(width: 16px)', '.inline > .size > span');
test_applied('(height: 32px)', '.size > .inline > span');
test_rejected('(height: 16px)', '.size > .inline > span');
// Name selection:
test_applied('a (width: 32px)', '.a-size > .b-size > span');
test_applied('b (width: 16px)', '.a-size > .b-size > span');
test_rejected('c (width)', '.a-size > .b-size > span');
test_applied('a (width: 16px)', '.a-size > .a-size > span');
// container-name alone does not establish a container:
test_applied('a (width: 32px)', '.a-size > .a > span');
// Can query container with multiple names:
test_applied('a (width: 32px)', '.ab-size > .size > span');
test_applied('b (width: 32px)', '.ab-size > .size > span');
test_rejected('c (width)', '.ab-size > .size > span');
// The following tests have three containers:
//
// outer -> 32x32px
// middle -> 16x16px
// inner -> 8x8px
// Combinations of name and implicit selection:
test_applied('a (width: 8px)', '.a-size > .b-size > .a-inline > span');
test_applied('b (width: 16px)', '.a-size > .b-size > .a-inline > span');
test_applied('a (height: 32px)', '.a-size > .b-size > .a-inline > span');
test_rejected('a (height)', '.a-inline > .b-size');
// Same tests as above, but logical versions:
test_applied('a (inline-size: 8px)', '.a-size > .b-size > .a-inline > span');
test_applied('b (inline-size: 16px)', '.a-size > .b-size > .a-inline > span');
test_applied('a (block-size: 32px)', '.a-size > .b-size > .a-inline > span');
test_rejected('a (block-size)', '.a-inline > .b-size');
</script>
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