[css-animation-worklet] IDL for StatelessAnimator doesn't make sense

[bzbarsky]

I was reading through https://drafts.css-houdini.org/css-animationworklet-1/ and the IDL global/exposure bits don't make any sense to me. For example, the draft has:

[Exposed=AnimationWorklet, Global=AnimationWorklet, Constructor
 (optional any options
)]
interface StatelessAnimator {
};

This defines an object which is supposed to be a global (hence Global=AnimationWorklet) but has a Constructor, so you can create multiple of them in a given global?

The IDL spec explicitly says for [Global]:

The [Global] extended attribute must not be used on an interface that can have more than one object implementing it in the same Realm.

which means it's not really compatible with [Constructor]. I filed whatwg/webidl#744 to make that very explicit.

Anyway, is this object constructible or a global? It can't really be both.

[bzbarsky]

StatefulAnimator has the same problem.

[majido]

You are correct. These shouldn't really have the [Global] attribute. This is a mistake. 😞

Given that we are dropping these interfaces as part of #850 so I will not attempt a fix directly to this issue.