Guideline 11 : Allow configuration and customization
Checkpoint 11.4 : Single-key access
Allow the user to override any binding in the user agent default keyboard configuration with a binding to either a key plus modifier keys or to a single key.
For each functionality in the set required by checkpoint 11.5, allow the user to configure a single-key binding. A single-key binding is one where a single key press performs the task, with zero modifier keys.
Sufficient techniques
The user agent may satisfy the requirements of provision two of this checkpoint with a "single-key mode." In a single-key mode, the complete set of functionalities required by provision two must be available through single-key bindings. The user must be able to remain in single-key mode until explicitly requesting to leave it.
Normative inclusions and exclusions
In this checkpoint, "key" refers to a physical key of the keyboard (rather than, say, a character of the document character set).
The user agent is not required to allow the user to override conventional bindings for the operating environment (e.g., for access to help).
Provision two of this checkpoint does not require single physical key bindings for character input, only for the activation of user agent functionalities.
If the number of physical keys on the keyboard is less than the number of functionalities required by checkpoint 11.5, then provision two of this checkpoint does not require the user agent to allow single-key bindings for all of the functionalities. The user agent should give preference to those functionalities listed in provision one of checkpoint 11.5.
This checkpoint is mutually exclusive of checkpoint 11.3 since it is specific to the keyboard and to emphasize the importance of easy keyboard access.