Ask HN: Accessible Applications in WebGL and for the Desktop?

I'm building a scheduling app right now using that renders directly on the desktop using opengl. I'm considering making a web version by compiling to web assembly. As I understand it, if I want to sell this application as a web app it needs to meet certain accessibility requirements. As far as I can tell that means I cannot sell the app and need to start over because opengl/webgl aren't particularly accessible on the desktop or browser. Am I legally required to build this as a traditional web app to meet accessibility requirements if I want to run it in a browser? Are requirements looser if I build it just as a desktop app?