Re: [csswg-drafts] [css-nesting]The parent selector should not be placed inside the subselector

```css
@nest .parent {
	.foo {
	  color: red;
	}
	.foo2 {
	  color: yellow;
	}	
	.foo3 {
	  color: blue;
	}
}
```
like less, I just write .parent once @tabatkins 

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