See Understanding Techniques. G21: Ensuring that users are not trapped in content Failures for Success Criterion 2.1.2 F10: Failure of Success Criterion 2.1.2 and Conformance Requirement 5 due to combining multiple content formats in a way that traps users inside one format type Back to top 2.1.3 Keyboard (No Exception) Level AAA All functionality of the content is operable through a keyboard interface without requiring specific timings for individual keystrokes. Understanding 2.1.3 Back to top 2.1.4 Character Key Shortcuts Level A (Added in 2.1) If a keyboard shortcut is implemented in content using only letter (including upper- and lower-case letters), punctuation, number, or symbol characters, then at least one of the following is true: Turn off: A mechanism is available to turn the shortcut off; Remap: A mechanism is available to remap the shortcut to include one or more non-printable keyboard keys (e.g., Ctrl, Alt); Active only on focus: The keyboard shortcut for a user interface component is only active when that component has focus. Understanding 2.1.4 Show Hide techniques and failures for 2.1.4 Sufficient Advisory Failures Sufficient Techniques for Success Criterion 2.1.4 Note: Other techniques may also be sufficient if they meet the success criterion. See Understanding Techniques.