Re: [csswg-drafts] [css-contain-2] Combination of shortcuts and values (#5506)

I am slightly inclined to only allowing combinations with additional values as it pushes authors to read a bit about the values, as @TimVevida wrote, it's logically a bit cleaner, and because there are no other properties with such duplications.

The syntax would then be

```
none | [ strict || style ] | [ content || size || style ] | [ size || layout || style || paint ]
```

Sebastian

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