:only-child pseudo-classDaniel GlazmanCSS 3 Module W3C Selectors Next :only-of-type pseudo-class Previous :last-of-type pseudo-class Test # 41 of 271 of the static tests category Testing :only-child pseudo-class ID 36 Date 2001-07-11 Revision 1.0
This paragraph should have normal background
This div contains only one paragraph
This paragraph should have green background
.red { background-color : red }
p:only-child { background-color : lime }
div.testText > div > p { margin-left : 1em }
<p xmlns="http://www.w3.org/1999/xhtml">This paragraph should have normal background</p>
<div xmlns="http://www.w3.org/1999/xhtml">This div contains only one paragraph
<p class="red">This paragraph should have green background</p>
</div>