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Z-index

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The z-index property is used in CSS and certain HTML elements. It specifies the z-order of an element and its descendants. When elements overlap, z-order determines which one covers the other. An element with a larger z-index generally covers an element with a lower one.

For a positioned box, the z-index property specifies:

  1. The stack level of the box in the current stacking context.
  2. Whether the box establishes a local stacking context.


ValuesEdit

  • auto - The box does not establish a new local stacking context. The stack level of the generated box in the current stacking context is the same as its parent's box.
  • <integer> - This integer is the stack level of the generated box in the current stacking context. The box also establishes a local stacking context in which its stack level is 0. This means that the z-indexes of descendants are not compared to the z-indexes of elements outside this element.

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