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The 

• user (

  Javadoc resource link
  className info.magnolia.cms.security.User renderType asynchronous

  )

• locale (java.util.Locale)
  
  

  Info
  Please note that ${ctx.locale} is different from ${cmsfn.language()}, the former referring to the locale currently used by the user, the latter to the locale currently used by the site. See also AdminCentral and public locales.

In addition, 

• aggregationState (

  Javadoc resource link
  className info.magnolia.cms.core.AggregationState renderType asynchronous

  )
• contextPath (current context path)
• request (javax.servlet.http.HttpServletRequest)
• servletContext (javax.servlet.ServletContext)

WebContext properties are null if the execution is not a Web page request.