IDAssignment

It's a Good Thing to ensure that there are IDs present the following JSF tags:

• anything that's a NamingContainer
  
  • PanelNavigationMenu
  • DataTable
  • NewspaperTable
  • Columns
  • Form
  • Tree
    
• elements that are "form fields"
  
  • any sort of input field
  • anything that is a button
    
• elements that send commands
  

Why? For portlets it is actually useful to not specify an ID on the NamingContainer so that it is automatically assigned using a dynamic namespace. That way you can have two instances of the same portlet on a page and the HTML ids will be different. --DaveBrondsema