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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Selectors Test: :has(:not()) invalidation for sibling change</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://drafts.csswg.org/selectors/#relational">
<style>
#test-container > div { background-color: green; }
#target1:has(:not(.item, :nth-child(3))) { background-color: red; }
#target2:has(:not(.item, :nth-last-child(3))) { background-color: red; }
</style>
<div id="test-container">
<div id="target1">
<div class="item"></div>
<div id="item1">This text should have a green background</div>
</div>
<div id="target2">
<div id="item2">This text should have a green background</div>
<div class="item"></div>
</div>
</div>
<script>
test(() => {
assert_equals(getComputedStyle(target1).backgroundColor, "rgb(255, 0, 0)");
assert_equals(getComputedStyle(target2).backgroundColor, "rgb(255, 0, 0)");
}, "Initially red");
function insertDivItemBefore(item) {
let div = document.createElement("div");
div.classList.add("item");
item.parentElement.insertBefore(div, item);
}
function insertDivItemAfter(item) {
let div = document.createElement("div");
div.classList.add("item");
item.parentElement.append(div, item.nextSibling);
}
test(() => {
insertDivItemBefore(item1);
assert_equals(getComputedStyle(target1).backgroundColor, "rgb(0, 128, 0)");
}, ":nth-child() enclosed by :not() matching after insertion");
test(() => {
insertDivItemAfter(item2);
assert_equals(getComputedStyle(target2).backgroundColor, "rgb(0, 128, 0)");
}, ":nth-last-child() enclosed by :not() matching after insertion");
</script>
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