ThemePreact/src/Fab.tsx

import { h, JSX } from "preact";

export default function Fab({
   className,
   children,
   alignLeft,
   ...props
}: JSX.HTMLAttributes<HTMLButtonElement> & { alignLeft: boolean }) {
   let cl = "ht-fab " + (alignLeft ? "ht-fab-left " : "");

   return (
      <button
         className={cl + (className || "") + (props.class || "")}
         {...props}
      >
         {children}
      </button>
   );
}