disabled, readonly and lockedBy combine rather than override

Editability is !disabled && !readonly && lockedBy === null, and the three states render independently. They mean different things and map to different accessibility semantics: disabled is unfocusable and natively disabled, readonly is focusable with aria-readonly, and lockedBy is focusable with aria-disabled plus the holder named.

Considered Options

• A precedence chain. A locked field would stop showing that it is also disabled — the same failure as picking one visual channel by precedence (see ADR-0010's state channels).

Consequences

A locked field never uses inert. It stays focusable so the value can be read and copied, and assistive technology can announce the reason.