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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Selectors Invalidation: :first-child :last-child</title>
<link rel="help" href="https://drafts.csswg.org/selectors-4/#the-first-child-pseudo">
<meta name="assert" content="This tests that the :first-child and :last-child selectors are effective">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
div {
color: black;
}
span:first-child {
color: blue;
}
span:last-child {
color: red;
}
</style>
</head>
<body>
<div id="target"><span>first-initially</span><span>last-initially</span></div>
<script>
'use strict';
const black = 'rgb(0, 0, 0)';
const blue = 'rgb(0, 0, 255)';
const red = 'rgb(255, 0, 0)';
test(() => {
const target = document.querySelector('#target');
const first = target.firstChild;
assert_equals(getComputedStyle(first).color, blue);
target.insertAdjacentHTML('afterbegin', '\n<span>foo</span><span>bar</span>');
assert_equals(getComputedStyle(target.firstElementChild).color, blue);
assert_equals(getComputedStyle(first).color, black);
while (target.firstElementChild !== first)
target.removeChild(target.firstElementChild);
assert_equals(getComputedStyle(first).color, blue);
}, 'Adding multiple nodes at once should invalidate :first-child correctly.');
test(() => {
const target = document.querySelector('#target');
const last = target.lastChild;
assert_equals(getComputedStyle(last).color, red);
target.insertAdjacentHTML('beforeend', '\n<span>foo</span><span>bar</span>');
assert_equals(getComputedStyle(target.lastChild).color, red);
assert_equals(getComputedStyle(last).color, black);
while (target.lastChild !== last)
target.removeChild(target.lastChild);
assert_equals(getComputedStyle(last).color, red);
}, 'Adding multiple nodes at once should invalidate :last-child correctly.');
</script>
</body>
</html>
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