I'll check runtime examples and their exported skeletons, thanks!

Thankfuly i'll not have any license conflicts due to not using any part of spine runtimes (i'm writing new runtime from scratch to match optimized engine rendering pipeline).

Hi! I'm creating custom runtime for my HTML5 game engine to provide best performance and by this i have to make custom runtime because of it's rendering pipeline. I've made basic integration with purchased Spine Essentials, but i want to provide full support for Spine Pro and here comes my question:
Is there a Runtime Developer license or something like that, so i can make full Spine integration without buying Pro version (i'm indie dev, so i don't have opportunity to upgrade to Spine Pro right now).

To prove it's legit project:

• Game prototype made with Oxygen game engine:
  http://soulhunter.psichix.io/
• Oxygen engine project:
  https://github.com/PsichiX/Oxygen
• Online Playground service:
  http://oxygen.experiments.psichix.io/p/r15hPq9EG

I would be very thankful for anything that will help me implement and test full Spine functionality