[css-fonts-4] Open ranges aren't allowed #1157
Description
Tab says:
Note that open ranges (such as (0, 1000)) aren't allowed in CSS.
Disallowing 0 is fine, but you have to provide a lower bound, such as
1, or define a behavior that handles values that approach 0 (such as a
UA-defined minimum that values are floored to). Disallowing 1000 (but
allowing 999.9999999) isn't allowed. (This is all per CSS design
principles; there's nothing that magically disallows this stuff except
convention).