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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-values/tree-counting/calc-sibling-function-in-shadow-dom.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<html>
<head>
<title>CSS Values Test: sibling-index() and sibling-count() in flat tree</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<style>
#host > * {
grid-column-start: sibling-index();
grid-row-start: sibling-count();
}
</style>
<div id="host">
<div>In host tree (1)</div>
<div>In host tree (2)</div>
<div slot="unknown">In host tree (3)</div>
<div id="target">In host tree (4)</div>
<div>In host tree (5)</div>
</div>
<script>
const shadowRoot = host.attachShadow({mode: 'open'});
shadowRoot.innerHTML = `
<style>
slot::slotted(*), * {
z-index: sibling-index();
order: sibling-count();
}
</style>
<section id="shadow-root-child">
<div>In shadow tree (1).</div>
<div>In shadow tree (2).</div>
<div>In shadow tree (3).</div>
<slot>In shadow tree (4).</slot>
<div id="target">In shadow tree (5)</div>
<div>In shadow tree (6)</div>
</section>
`;
test(() => {
assert_equals(getComputedStyle(target).zIndex, '4', 'sibling-index(), rule from shadow tree');
assert_equals(getComputedStyle(target).order, '5', 'sibling-count(), rule from shadow tree');
assert_equals(getComputedStyle(target).gridColumnStart, '4', 'sibling-index(), rule from light tree');
assert_equals(getComputedStyle(target).gridRowStart, '5', 'sibling-count(), rule from light tree');
}, 'Host children have sibling-index() and sibling-count() based on the DOM tree order');
test(() => {
const shadowTarget = shadowRoot.getElementById('target');
assert_equals(getComputedStyle(shadowTarget).zIndex, '5', 'sibling-index()');
assert_equals(getComputedStyle(shadowTarget).order, '6', 'sibling-count()');
}, 'Shadow children have sibling-index() and sibling-count() based on the DOM tree order')
test(() => {
const shadowRootChild = shadowRoot.getElementById('shadow-root-child');
assert_equals(getComputedStyle(shadowRootChild).zIndex, '2', 'sibling-index() for direct shadow root child');
assert_equals(getComputedStyle(shadowRootChild).order, '2', 'sibling-count() for direct shadow root child');
}, 'Direct shadow root children have correct sibling-index() and sibling-count()')
</script>