If a link causes something to happen when a user tabs into it, this could be confusing for people with cognitive disabilities or people using assistive technologies, such as screen readers or screen magnifiers. For example, if a link causes a drop-down menu to open when it is tabbed into by the user, the user may not realise that this has occurred. Alternatively, the new window may overlay the existing content and the user may not understand what has happened.
Ensure that any change of context that is caused by a link (e.g. a drop-down menu opening) is only triggered by a specific action, such as clicking on the link. If a change of context must occur automatically, try to ensure that the user is clearly notified.
No example is available.