CLASS attribute
The CLASS attribute defines the behavior of a field defined with the
WIDGET attribute.
Syntax
Important: This feature is deprecated, and may be removed
in a future version.
CLASS = "identifier"
- identifier is a predefined keyword defining the class of the field.
 
Usage
The CLASS attribute can only be used with the
    WIDGET attribute. It is ignored if WIDGET is
    not used.
Note: The 
            CLASS attribute is deprecated, use new
form item types instead.| Class | Description | 
|---|---|
KEY | 
                            Field is used to trigger a keystroke
instead of being a normal input field. Only supported with
  | 
                        
PASSWORD | 
                            Field input is masked by replacing normal character echo with stars. |