:only-child

jQuery :only-child filter test

by Yohan Yang

HTML

<p>
    <span>P > SPAN</span>
    <button>P > SPAN + BUTTON</button>
</p>
<p>
    <button>P > BUTTON</button>
</p>

CSS

p {border-right: 1px solid red; padding: 10px;}
.on {background-color: yellow; }

JavaScript

$('button:only-child').addClass('on');