Just by receiving focus, do not cause any situation change. An example of a malfunction that a modal window that opens automatically when receiving focus and a page movement occurs when receiving focus. Such behavior is difficult for users to predict and is hard to handle.
|Principle||Understandable||Information and the operation of user interface must be understandable.|
|Guideline||Predictable||Make Web pages appear and operate in predictable ways.|
|Neither component causes a change in context when it receives focus.|