- Helical milling
- 3 +2axis positioning
- https://www.netguru.com/codestories/few-tips-that-will-make-your-pwa-on-ios-feel-like-native
- https://iconifier.net/
- https://www.paintcodeapp.com/news/ultimate-guide-to-iphone-resolutions
- https://developers.google.com/web/ilt/pwa/introduction-to-service-worker
- https://coderwall.com/p/vmkk6a/how-to-make-the-canvas-not-look-like-crap-on-retina