A rich text editor that allows complex styling and formatting.
Because some browsers do not support rich text editing, and others support
only a limited subset of functionality, there are two formatter interfaces,
accessed via
RichTextArea.getBasicFormatter() and
RichTextArea.getExtendedFormatter() .
A browser that does not support rich text editing at all will return
null for both of these, while one that supports only the basic
functionality will return null for the latter.
CSS Style Rules
.gwt-RichTextArea { }
Inner Class :public interface BasicFormatter
Inner Class :public interface ExtendedFormatter extends BasicFormatter