Accessibility of a Web Dynpro
Application 
For more information, refer to the
chapter 
Accessibility.
To make a business application available to those users who are dependent on technical support of various kinds due to disability, the Web Dynpro framework provides them with the option of setting up accessible applications.
You will
find more information on the screen read program supported by SAP in the
chapter Using
the Screen Reader JAWS with SAP Software
The “Tooltip” Property
An important prerequisite for providing this accessibility is the availability of a tooltip for each UI element since tooltips are evaluated with the help of screen reader programs and can therefore be made accessible for visually impaired users. Each UI element provides such a tooltip.
A tooltip must be maintained for a UI element to ensure accessibility whenever
· The UI element does not have a heading.
· No label is assigned to the UI element.
· No text is available on the pushbutton.
A tooltip must be maintained for some more complex UI elements. Examples of these are the UI elements Tree or ProgressIndicator.
When you activate your component, you are made aware of the missing content of the tooltip property through an appropriate message – provided this property would have been necessary for the accessibility of the application. You have the option, however, of dynamically defining the value for the tooltip property. This option is not covered by the syntax check.
In addition, the tooltip property must always be set, for example, to relate further semantic information on the UI element.
The Accessibility Description
Almost all UI elements additionally provide the property Accessibility Description. This can be used to include a title, as an alternative, whenever the UI element should not or cannot carry a visible title (header). In contrast to the case with the tooltip, which should contain a semantic description of the purpose of the UI element, only a short, title-like expression is entered in the accessibility description
For more information on the individual UI elements, refer to the Reference Part of this documentation.