A plain-language romp through the trials and tribulations of z-indexby Isabel Brison. On the surface, z-index seems simple. It's a number and it represents what is on top of what... assuming it is positioned... and assuming it is within the same stacking context as the other things.
... that is the gist of it: stacking contexts are caused by a variety of properties and the main reasons for their existence are performance concerns and ease of implementation by browsers. They are not always related to z-index or ordering; they pop up wherever it makes sense to have several elements all on the same layer for rendering purposes.
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