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<!DOCTYPE html>
<title>CSS Values and Units Test: sibling-index() and sibling-count() in container queries</title>
<link rel="help" href="https://drafts.csswg.org/css-values-5/#tree-counting">
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-features">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
@property --length {
syntax: "<length>";
initial-value: 0px;
inherits: false;
}
.container { container-type: inline-size; }
#c1 {
width: 100px;
--length: 100px;
}
#c2 {
width: 400px;
--length: 400px;
}
span {
--match-100: no;
--match-400: no;
}
@container (width = calc(100px * sibling-index())) {
span { background-color: green; }
}
@container (width = calc(200px * sibling-count())) {
span { color: lime; }
}
@container style(--length: calc(100px * sibling-index())) {
span { --match-100: yes; }
}
@container style(--length: calc(200px * sibling-count())) {
span { --match-400: yes; }
}
</style>
<div style="color:black">
<div id="c1" class="container">
<span id="t1"></span>
</div>
<div id="c2" class="container">
<span id="t2"></span>
</div>
</div>
<script>
test(() => {
assert_equals(getComputedStyle(t1).backgroundColor, "rgb(0, 128, 0)");
assert_equals(getComputedStyle(t1).color, "rgb(0, 0, 0)");
}, "sibling-index() in @container width query");
test(() => {
assert_equals(getComputedStyle(t2).backgroundColor, "rgba(0, 0, 0, 0)");
assert_equals(getComputedStyle(t2).color, "rgb(0, 255, 0)");
}, "sibling-count() in @container width query");
test(() => {
assert_equals(getComputedStyle(t1).getPropertyValue("--match-100"), "yes");
assert_equals(getComputedStyle(t1).getPropertyValue("--match-400"), "no");
}, "sibling-index() in @container style() query");
test(() => {
assert_equals(getComputedStyle(t2).getPropertyValue("--match-100"), "no");
assert_equals(getComputedStyle(t2).getPropertyValue("--match-400"), "yes");
}, "sibling-count() in @container style() query");
</script>
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