displayLevels: [11, 12, 13, 14, 15]
However, by specifying the level of LODs, the zoom function is not limited to the set constraint. The zoom function is still functional, and the user can still zoom to the minimum level (0) and the maximum level of a web map (23).
The blog post, ArcGIS Blog: Web map zoom levels updated describes the levels' resolution and scale detail.
In conclusion, the zoom function cannot be restricted to the defined LODs, but the display of the data or map services can be.