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What is the difference between:
z-index: autoz-index: 0z-index at allAll the above scenarios are for a div that encloses two divs, div1 and div2 each having a z-index which is 9 and 10 respectively.
The enclosing div is in the stacking context of HTML.
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z-index: auto. For a positioned box (that is, one with any position other than static ), the z-index property specifies: The stack level of the box in the current stacking context. Whether the box establishes a local stacking context.
Z Index ( z-index ) is a CSS property that defines the order of overlapping HTML elements. Elements with a higher index will be placed on top of elements with a lower index. Note: Z index only works on positioned elements ( position:absolute , position:relative , or position:fixed ).
Positioning and order In order for z-index to have any effect at all, it needs to be applied to a positioned element, that means, an element with position relative , absolute , fixed , or sticky . If you don't apply a z-index , the elements will be stacked in the order they are written in the HTML.
To sum up, most issues with z-index can be solved by following these two guidelines: Check that the elements have their position set and z-index numbers in the correct order. Make sure that you don't have parent elements limiting the z-index level of their children.
Not specifying z-index is the same as z-index: auto; that is its initial value.
auto and 0 mean the same thing if your element doesn't create its own stacking context; e.g. it is not positioned as relative, absolute or fixed.
If your enclosing div isn't positioned, then whatever you set its z-index to doesn't matter; it and all its contents will participate in the stacking context of html, and its descendants will always be positioned in front of it.
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