Good news, everyone! We recently added a bunch of stuff to the documentation that covers custom axis creation. In it, every property of an intent.responsive({...}) axis is explained. There’s also some helpful tips for avoiding common mistakes and best practices to achieve what you want.
We also added some information on initializing intention.js. This is vital information if you are not using context.js. Context takes care of a lot of the initialization, but some legwork is needed when going solo. And we encourage you to do so!
Should you need any additional explanation or help, feel free to email us or talk to us on Twitter (@intentionjs).
Good luck!