https://drafts.csswg.org/css-contain-3/#container-type

Value: normal || [ size | inline-size ]

But normal size and normal inline-size don't make sense.

normal establishes a query container for container style queries, but that's the default, included in size and inline-size:

Unless otherwise noted, all elements are query containers for the purpose container queries that do no require explicit containment (such as container style queries)

The definitions are even contradictory, e.g. with normal size, both of these apply:

The element is not a query container for any container size queries

Establishes a query container for container size queries

So the syntax should just be normal | size | inline-size.