Can we actually build a <Popover /> component just like shadcn/ui from scratch? Yes — and it's easier than you might think. A few weeks ago, I was struggling with the usual popover headaches: - Z-index conflicts - Positioning issues inside deeply nested containers - Content getting clipped by parent elements with overflow: hidden Then I discovered (and truly understood) ReactDOM.createPortal. Here's the game-changer: By using a portal, we can render the PopoverContent outside the normal DOM tree — directly into the <body> (or a dedicated portal container). This instantly solves: - Z-index battles - Clipping and overflow problems - Complex positioning issues But I didn't stop there. I also added smart positioning logic (inspired by how shadcn + Radix UI works): → When the PopoverContent doesn't have enough space at the bottom, it automatically flips and appears on top of the trigger. → Same for left/right sides. The result? A clean, smooth UX that feels premium — exactly like shadcn/ui's popover. This small deep dive into frontend system design taught me something important: The real skill upgrade doesn't come from just copying components. It comes from understanding why they work the way they do — and then building them yourself. Portals + floating UI logic = powerful mental model for any overlay (tooltips, dropdowns, modals, etc.). Have you built your own popover or tooltip from scratch? Or are you still fighting z-index wars in your projects? 😅 Drop a comment — I'd love to hear your experience (and any tips you have!). #React #Frontend #WebDevelopment #JavaScript #SystemDesign #shadcn

Here’s the complete code for the custom Popover component using createPortal + smart positioning: [https://codesandbox.io/p/devbox/wt8q9d] Key parts: • Popover + PopoverTrigger + PopoverContent • Uses ReactDOM.createPortal • Auto flip logic (bottom → top) • Clean and reusable just like shadcn/ui

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