Client

Name: client
Namespace: http://www.zkoss.org/2005/zk/client
Namespace shortcut: client
Java: org.zkoss.zk.ui.metainfo.LanguageDefinition#CLIENT_NAMESPACE

It is the reserved namespace for specifying ZK client-side widget’s event listeners and properties.

For example,

<combobox xmlns:w="client" w:onFocus="this.open()"/>

For more information, please refer to ZK Client-side Reference.