<meta charset="utf-8">

<title>CSS Selectors :only-child</title>

<link rel="help" href="https://drafts.csswg.org/selectors-4/#the-only-child-pseudo">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div id="target1">Whitespace nodes should be ignored.</div>

<div id="target2">A comment node should be ignored.</div>

<!-- -->

<div id="target3">Non-whitespace text node should be ignored.</div>

.

<blockquote></blockquote>

<div id="target4" data-expected="false">There is another child element.</div>

<div id="target5"></div>

for (let i = 1; i <= 4; ++i) {

let target = document.querySelector(`#target${i}`);

test(() => {

if (target.dataset.expected == 'false')

assert_false(target.matches(':only-child'));

else

assert_true(target.matches(':only-child'));

}, target.textContent);

test(() => {

const target = document.querySelector('#target5');

assert_true(target.matches(':only-child'));

const another = target.parentNode.appendChild(document.createElement('div'));

assert_false(target.matches(':only-child'));

assert_false(another.matches(':only-child'));

another.remove();

assert_true(target.matches(':only-child'));

}, 'Dynamic addition and removal');