Why CSS Overflow Clips Dropdowns and How Developers Can Fix It

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A common front-end problem occurs when custom dropdown menus inside modals get visually cut off, with options appearing partially or not at all. The root cause is CSS overflow properties like auto and scroll, which clip painted content at the element's padding box boundary — not just hide it behind a scrollbar. Raising z-index offers no fix because the issue is clipping during paint, not stacking order. Native HTML select elements avoid this by rendering their dropdown lists on a separate browser layer, outside the normal CSS box model. Developers using headless UI components must account for this by repositioning dropdown panels outside overflow-clipped ancestors, often via portals or fixed positioning.

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