J.3.5 Themes and Contrast Support

Users often have unique demands of their computing environment (e.g., high contrast by default) and the settings associated with these demands should be followed by any accessible Office Open XML implementation. System-wide settings should never be disabled or disregarded by a product if they are intended to increase accessibility. Many users require specific high-contrast combinations, such as white text on a black background. Drawing these reversed, as black text on a white background, causes the background to bleed over the foreground and can make reading difficult, even painful, for some users. Text is most legible for everyone when drawn on a plain background of a contrasting color. Text

drawn over a variegated background, such as a wash of colors or a bitmap, can be difficult to read for the person without disabilities, and can be unreadable for users who have turned on a high contrast-like mode.