Applies to all technologies.
This failure relates to:
Without prior instruction, unexpected change of context due to change of user interface setting can sometimes confuse users. Users must receive instruction prior to such encounter. Providing the instruction in a way in which the user may not have the opportunity to review may leave opportunity for confusion.
Failure examples:
Not providing instruction on the Web page preceding the user interface element that causes change of context by change of setting.
Not providing instruction at a part of the process prior to the step where they may encounter such change of context, in case of a multi-step process in which users must go through particular steps to reach the user interface element where change of setting would cause a change of context.
Not providing mandatory instruction about the change of context in the case of intranet Web application.
Find occurrence of change of context due to change of user interface setting
Find instructional material that all users must review prior encountering of the change of context.
If #1 is true and #2 is false, then this failure condition applies and content fails the Success Criterion.
Techniques are informative—that means they are not required. The basis for determining conformance to WCAG 2.0 is the success criteria from the WCAG 2.0 standard—not the techniques. For important information about techniques, please see the Understanding Techniques for WCAG Success Criteria section of Understanding WCAG 2.0.