Well today I had to face this situation since I am a newbie in ZK Framework. In a single line in my code I had to leave a new space between two different components I found the solution first of all we need to add the ZK html namespace in our code and with the namespace we can use zk specialized html elements
<zk xmlns:h="http://www.w3.org/1999/xhtml" xmlns:zk="http://www.zkoss.org/2005/zk"> <window title="ZK HTML Elements" width="300px" border="normal"> <label value="First element"/> <h:br /> <label value="Second Element" /> <h:br /> <h:p>Another<h:br /> break <h:br /> example </h:p> </window> </zk>