4. Understanding and Managing z-index - Developing Web Components [Book]
CSS z-index Property
zIndex on toast with Dialog not working · Issue #2080 · primefaces/primereact · GitHub
CSS Z-Index Not Working? How to Fix It Using Stack Order
z-index - CSS: Cascading Style Sheets | MDN
Component: Sidebar, base-z-index is not applied in vite-hmr-dev mode on Vue 3.2.37 when visible ref comes from store. · Issue #2659 · primefaces/primevue · GitHub