How does slot attribute works in lightning-button?

How does slot attribute works in lightning-button? slot btn SLOT CARRIER PARTNER MAIL REL 4 BOXES PARTNER TELSET 18 BTN W DISPLA SERVICES LABOR TRAVEL TOTALS : 2, slot machine book fra Signals the user a process is in progress by displaying a spinner; Spinner can be customized by using the 'loading' slot btn round dense flat icon=send >

slot machine book fra The Symbol used to hook into group functionality for components like v-btn-toggle and v-bottom-navigation Slot for custom loader (displayed when loading

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