jquery-selector-extension-alt.xml

<?xml version="1.0"?>
<note>
	Because <code><placeholder name="selector"/></code> is a jQuery extension and not part of the CSS specification, queries using <code><placeholder name="selector"/></code> cannot take advantage of the performance boost provided by the native DOM <code>querySelectorAll()</code> method. For better performance in modern browsers, use <code><placeholder name="alt"/></code> instead.
</note>