I don't see the point of the premature extensability. You can always make it inherit from InkPresenter in the future if such a need would arise. I don't think that is going to be a big breaking change as people shouldn't rely on it not inheriting from it or it not inheriting from anything
```webidl
interface InkPresenter {
}
interface DelegatedInkTrailPresenter : InkPresenter {
...
```
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