in slot ✓ Built-in Slot Types

in slot A slot is a narrow opening in a machine or container, for example a hole that you put coins in to make a machine work in slot Slot definition: a narrow, elongated depression, groove, notch, slit, or aperture, especially a narrow opening for receiving or admitting something,

in slotSlots are a mechanism for Vue components that allows you to compose your components in a way other than the strict parent-child relationship

in slot The short answer to your question is: in, or to give no preposition at all My history class is in slot 1