Toggling an @property rule

@property --index rule enabled

--multiplier in the value

Registered, --index computes to a number on .second-item, and that computed 2 inherits to the child.

Unregistered, the child inherits the unresolved token sibling-index(), which resolves against the child's position instead, giving 1.

• --index on .second-item:
• --index on the child:
• scale on the child: