When using color to provide information, provide the same information to people who cannot perceive color or additional markup.
Example. An examination. Students view an SVG image of a chemical compound and identify the chemical elements present based on the colors used in the diagram. The diagram uses the initial letters of the colors so that students who cannot perceive the colored diagram have the same information as their classmates. (Text alternatives associated with each element name the color of the element and indicate the element's position in the diagram. Students who cannot perceive the diagram have the same information about the compound as their classmates, as required by Guideline 1.1 Level 1.)