Re: [csswg-drafts] Interoperable font metrics via explicit font metrics overrides (#4792)

![2020-09-23 16_18_47](https://user-images.githubusercontent.com/2784308/93990704-0522c600-fdbe-11ea-9fcf-7f6fe2fe0a29.gif)
How to solve the punctuation marks, I tried to use unicode-range to cover the punctuation marks individually, and found that line-gap-override will take effect for the entire font. Advance-override can only control the right width of characters. Is this a bug in Chrome?

Demo: https://codepen.io/yisi/pen/xxVmzOM

```css
@font-face {
  font-family: 'STSongti-SC-Regular-punctuation';
  advance-override: -0.4; 
  src: local(STSongti-SC-Regular);
  unicode-range: U+b7;
}
```

![image](https://user-images.githubusercontent.com/2784308/93994044-07871f00-fdc2-11ea-8e90-d6e0e7bb9ab7.png)


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