Common Desktop Environment: Style Guide and Certification Checklist

Resolutions

The desktop accommodates three display resolutions: low resolution (640x480), medium resolution (800x600), and high resolution (mega-pixel). The size of the Front Panel and some of the icons change automatically depending on the display resolution. For this reason, your application must provide different sized icons.

Recommended 

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Any icons or graphics displayed by your application are designed to be distinguishable on low- (640x480), medium- (800x600), and high- (mega-pixel) resolution displays. Alternatively, your application provides different sized visuals for low-, medium-, and high-resolution displays.