Describing what will happen before a change to a form control that causes a change of context to occur is made

Important Information about Techniques

See Understanding Techniques for WCAG Success Criteria for important information about the usage of these informative techniques and how they relate to the normative WCAG 2.1 success criteria. The Applicability section explains the scope of the technique, and the presence of techniques for a specific technology does not imply that the technology can be used in all situations to create content that meets WCAG 2.1.


Applies to all technologies.

This technique relates to:


The objective of this technique is to provide information to users about what will happen when a change to a form control results in a change of context. Because changing the value of a form control does not typically result in a change of context, it is important that authors provide instructions that make the user aware of the behavior in advance. Where possible, it is a good idea to programmatically associate the instructions describing the change with the form control itself.

The following are some examples of how to provide the instruction in different situations.




  • Locate content where changing the setting of a form control results in a change of context
  • Check to see that an explanation of what will happen when the control is changed is available prior to the controls activation

Expected Results

  • Check #2 is true.