Re: [csswg-drafts] [web-animations-1] Object-form keyframe with offset: 1 (#5664)

> I'm using only one offset value in my implementation as I'm still not sure why keeping both specified/computed offsets would be required.

Right, it's mostly so that authors can roundtrip `null` offsets. e.g.

```js
const anim = elem.animate({ left: ['0px', '100px'] }, 2000);
anim.effect.setKeyframes(anim.effect.getKeyframes().concat('-50px'));
```

Without distinguishing between specified and computed, the returned keyframes would have resolved computed offsets and you'd lose the auto-spacing behavior.

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