Re: [w3ctag/design-reviews] Declarative Interactions (Issue #1111)

Shrinivassab left a comment (w3ctag/design-reviews#1111)

Hi Stefan, TAG team,

Thanks for sharing this, the explainer clearly highlights a performance bottleneck we have all encountered. I am particularly excited by the idea of triggering animations outside the window event loop, and I can see strong value for UI frameworks and design systems.

Some thoughts and questions as a frontend engineer working primarily with Angular (and Signals-first state models):

- Many component frameworks now encapsulate interaction logic (e.g., Angular, Lit, React). How might `animation-trigger` interact with Shadow DOM or scoped styles where the trigger/target span encapsulated DOM trees?
- Would this allow fine-grained triggers tied to accessibility settings, like `prefers-reduced-motion` or assistive input methods?
- Could there be extensibility for custom gestures (e.g., long press, pointer drag) in future iterations of this model?
- Do you envision this working alongside frameworks that already use Signals/Reactive Graphs to model UI state (e.g., Angular 17+ with `@signal()` or React Compiler)? I’m exploring declarative reactivity architectures and wonder if `animation-trigger` could complement or inspire similar mechanisms in the framework layer.

This proposal feels like a meaningful step toward bridging native-level smoothness in web UI. Happy to share examples or usage feedback as this evolves.


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