Students can develop any program they choose (e.g., an app, a game, art design, etc.) with their choice of programming language to meet all the criteria in the Create performance task. A list of suggested programming languages is provided in the Instructional Approaches section of the AP Computer Science Principles Course and Exam Description (.pdf/2.05 MB). Though this is not a comprehensive list, it is a point of reference to determine what will work best for a student.
Note: While teacher may choose to do some programming instruction using HTML, it should be noted that HTML is not an acceptable programming language to use when completing the Create performance task.