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This is a beta feature :)

There are only limited number of functions and support available when editing in the browser using Processingjs, javascript port of Processing language.

For full functionality, you should download and use Processing IDE on your computer to create sketches. Then, you can upload them to OpenProcessing.

Basic syntax information:
Processingjs.org

Available functions in Processingjs:
Reference

Basic tutorials for Processing language:
external Tutorials

For any issues, shoot an email:
contact