A switch has the markup of a custom checkbox but uses the .form-switch class to render a toggle switch.
                       Use the .switch-state and icon-state through defined icons switches.
                       Use the .bg-* class through created default switches. 
                       Use the .switch-outline and .icon-state class through created outline and icons. 
                       Use the .switch-outline  class through created outline. 
                       Use the .tgl-skewed/tgl-flip class through created variations. 
Skewed
Flip
Checked
Flat
                       Use the .switch-sm and .switch-lg class through defined switch sizing.
                       Use the .icon-state class through visible icons in switches.