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

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

Hi @szager-chromium, the TAG discussed it and are happy with attempts to offload the main thread. We also have a few questions:

1. Should this be an early design review?
2. This proposal introduces yet another name into CSS to find the trigger element, while it can be done via selectors. Have you considered using selectors instead of names?
3. The `animation-trigger-event` functions seem rather underspecified. The exact design of the set of supported events can be critical to the success of this feature:
   - The `click()` in the example suggests that we can use those defined in [UI Events](https://w3c.github.io/uievents/) as trigger events, so that the main thread can be offloaded. However, not all UI events make sense here (e.g. `unload`), and some must involve the main thread (e.g. `input`)
   - This adds a strong dependency between CSS Animations and UI Events specs, which might be a heavy maintenance workload in the future.

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