Re: [csswg-drafts] [css4-fonts] support for OpenType font variations

I wonder if we could actually leverage `@font-face` blocks to define 
fallbacks and corrections, and then reference which font family you 
want to use as the fallback in an actual web font block like 
@bramstein outlined above. This would allow us to use `@font-face` for
 normal webfonts and more closely matched fallbacks, and only browsers
 that understand `@font-variation` would pay attention to the new 
block.

```
@font-face {
  font-family: Helvetica;
  font-size: 0.975em; (this is relative to whatever the size it’s 
replacing)
  letter-spacing: -0.5px;
}
@font-face {
  font-family: "Droid Sans";
  font-size: 0.975em; (this is relative to whatever the size it’s 
replacing)
  letter-spacing: -0.5px;
}
@font-face {
  font-family: SomeWebFontName;
  src: …
  font-fallback: Helvetica, “Droid Sans”;
}
@font-variation {
  font-family: SomeWebFontName;
  src: …
}
```
This extends the ideas I was trying to articulate here: 
https://github.com/w3c/csswg-drafts/issues/450

but seems to dovetail nicely with this approach.

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