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<!DOCTYPE html>
<html>
<head>
<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>
<!--
See also child-indexed-pseudo-class.html.
-->
<body>
<div>
<div id="target1">Whitespace nodes should be ignored.</div>
</div>
<div>
<div id="target2">A comment node should be ignored.</div>
<!-- -->
</div>
<div>
<div id="target3">Non-whitespace text node should be ignored.</div>
.
</div>
<div>
<blockquote></blockquote>
<div id="target4" data-expected="false">There is another child element.</div>
</div>
<div>
<div id="target5"></div>
</div>
<script>
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');
</script>
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