Re: [csswg-drafts] [css-values] Retiring support for 3-valued positions (excluding background)

The syntax for [position](https://drafts.csswg.org/css-values-4/#typedef-position) has limited alternatives:

```
<position> = [
  [ left | center | right ] || [ top | center | bottom ]
|
```
1 or 2 values
```
  [ left | center | right | <length-percentage> ]
  [ top | center | bottom | <length-percentage> ]?
|
```
1 or 2 values
```
  [ [ left | right ] <length-percentage> ] &&
  [ [ top | bottom ] <length-percentage> ]
]
```
4 values

> Right, I'm pointing out that 3-value syntaxes that use 'center' as one of the keywords (e.g. center top 3px) are still valid with the change

How is that still valid?


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