2013 California Standards for Accessible Design Pocket Guide

11B-707.6.3 Function keys.

 Function keys shall comply with Section 11B-707.6.3.

11B-707.6.3.1 Contrast .

Function keys shall contrast visually from background surfaces. Characters and symbols on key surfaces shall contrast visually from key surfaces. Visual contrast shall be either light-on-dark or dark-on-light.

Exception:  Tactile symbols required by Section 11B-707.6.3.2 shall not be required to comply with Section 11B-707.6.3.1.

11B-707.6.3.2 Tactile symbols.

Function key surfaces shall have tactile symbols as follows: Enter or Proceed key: raised circle; Clear or Correct key: raised left arrow; Cancel key: raised letter ex; Add Value key: raised plus sign; Decrease Value key: raised minus sign.