Note that z-index stacking applies only to sibling elements (i.e., elements that are children of the same container). If two elements that are not siblings overlap, setting their individual z-index attributes does not allow you to specify which one is on top. Instead, you must specify the z-index attribute for the two sibling containers of the two overlapping elements.
--<<JavaScript: The Definitive Guide, 5th Edition >> 16.2.4. The Third Dimension: z-index
本文探讨了CSS中z-index属性的应用原则,特别是在处理非同级元素堆叠时的限制及解决方案。指出z-index仅适用于同级元素,并强调通过调整包含重叠元素的容器层级来实现正确的视觉堆叠顺序。
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