Re: [heycam/webidl] How to tell the type of "construct a callback function"? (#557)

> @yuki3 would you be willing to work on spec PRs for these things?

I'm a totally newbie about spec work, but let me give it a try.


By the way, IIUC, [CSS Painting API](https://www.w3.org/TR/css-paint-api-1/#invoke-a-paint-callback) and [Animation Worklet](https://wicg.github.io/animation-worklet/#create-a-new-animator-instance) are willing to follow the same (or similar at least) way to custom elements, and will use the 'construct' algorithm of IDL callback function.

Animation Worklet passes a list of (options, state) as the arguments in the constructor.


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