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Stacking Context trong CSS là gì và hoạt động như thế nào? · ORA·tech

Trung bình Pro#css

Stacking Context trong CSS là gì và hoạt động như thế nào?

15 tháng 2, 2026

Tóm tắt nhanh

Stacking Context là một môi trường ba chiều ảo dọc theo trục Z, quyết định thứ tự hiển thị (trên/dưới) của các phần tử HTML. Một phần tử con có `z-index` cực lớn vẫn có thể bị che khuất nếu Stacking Context cha của nó có thứ tự ưu tiên thấp hơn Stacking Context đối thủ.

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