<!DOCTYPE html>
<html>
<head>
<title>CSS Selectors Invalidation: insert sibling of ancestor</title>
<link rel="help" href="https://drafts.csswg.org/selectors-4/#adjacent-sibling-combinators">
<meta name="assert" content="This tests that the + next-sibling selector is effective">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.c * { background-color: blue; }
.a + * + .c * { background-color: green; }
</style>
</head>
<body>
<div>
<div id="first" class="a"></div>
<div></div>
<div class="c">
<div>
<div id="target"></div>
</div>
</div>
</div>
<script>
'use strict';
const green = 'rgb(0, 128, 0)';
const blue = 'rgb(0, 0, 255)';
test(function() {
const first = document.getElementById('first');
const target = document.getElementById('target');
const parent = first.parentElement;
assert_equals(getComputedStyle(target).backgroundColor, green, "initial color");
parent.removeChild(first);
assert_equals(getComputedStyle(target).backgroundColor, blue, "color after removal");
parent.insertBefore(first, parent.firstChild);
assert_equals(getComputedStyle(target).backgroundColor, green, "color after insert")
}, "Remove/Insert earlier sibling of ancestor");
</script>
</body>
</html>
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