Classes list

Every class FAB recognizes, straight from the @flickui/css source.

ClassPurpose
.fabBase class — required on every FAB
.fab-iconSizes the icon glyph consistently relative to the button
.fab-extendedAdds horizontal padding, turning the circle into a pill for icon + label
.fab-loweredReduces the drop-shadow elevation
.toggle-targetBehavior hook — opens/toggles the component referenced by aria-controls/href
.action-*Behavior hooks for in-markup actions (same vocabulary as .btn)