[zackbrown]

Pax's primary goal is "designability" — to enable a vector design tool to read & write the same content & behavior you may write by hand. (.pax files)

Our solution requires language constraints — a hermetic separation of concerns between the declarative description language (.pax) and a Turing-complete programming language (starting with Rust.)

These language constraints and rendering requirements[0] are so core to our solution that building anywhere other than the systems level was not tenable.

[0] Specifically, the runtime must render in "design tool coordinates," to enable a vector design tool authoring UX. This authoring experience must also be extremely fast, like Figma's. The rendering engine must be designed around this requirement and neither HTML/CSS's or Flutter's were.