Re: [csswg-drafts] [css-timing-2] - Custom Timing Functions in JavaScript

@vidhill I looked over your proposal (and followed some of the links 
in it) and have a few thoughts of how to tie some of your ideas into 
this proposal.  

**In JavaScript**
```js
// registers the timing-function for use in CSS
window.registerTimingFunction('frames', (frameCount) => {
    // allows for pre-calculation based on input
    const co = 1 / (frameCount - 1);

    // returns the function to sample the curve
    return (offset) => {
        const out = floor(offset * frameCount) * co;
        return offset >= 0 && out < 0 ? 0 : offset <= 1 && out > 1 ? 1
 : out;
    };
});
```

**In CSS**
```css
.stopwatch {
    animation: tick 1s frames(60);
}
```

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