Re: [csswg-drafts] [css-counter-styles] Clarify what to do when 'symbols' has only one symbol for 'alphabetic' and 'numeric' systems? (#5698)

I guess an analogous example is https://drafts.css-houdini.org/css-properties-values-api/#initial-value-descriptor

```css
@property --foo {
  syntax: "<length>";
  inherits: false;
  initial-value: 1px;
  initial-value: 1;
}
```
where the `initial-value: 1` is invalid according to the `syntax: "<length>"` grammar. Then the entire `@property` rule is invalid, it doesn't fall back to `initial-value: 1px`.


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