The Ontario Design System is the mandatory standard for all public-facing Government of Ontario digital services, built with Stencil-compiled web components and installable via npm or CDN.
Because components are built with Stencil as true web components (not a React-specific library), the same package works across whatever framework each Ontario government team happens to use, a genuinely framework-agnostic answer to a large, technically diverse government IT environment.
Developers on multi-framework government or enterprise projects who need one component set that works regardless of which frontend framework a given team already uses.
Every public-facing Ontario government digital service is required to use this system, worth checking the release notes directly since adoption is mandatory rather than optional.
Ontario's own toolkit for consistent digital government services.
