Re: [csswg-drafts] [web-animations-2] Idea: Custom Effects

_From @Martin-Pitt on August 11, 2016 12:26_

Do agree that in terms of flexibility/compat passing an options object makes more sense.

However still think we can go a level lower by not having the element as it is still implying a dependency with the DOM.

I noticed that computed timing options have a `progress` which is equivalent to the fraction from onsample, so this object does make a lot more sense and gives all the info needed.


Perhaps this then?
```javascript
const effectOptions = {
    onsample(timing) {
        let fraction = timing.progress;
    }
};
const timingOptions = {
    duration: 1250,
    easing: 'ease-in'
};
const effect = new WebEffect(effectOptions, timingOptions);
const animation = new Animation(effect, document.timeline);
animation.play();
```

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