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z-index is a CSS property that sets the stack order of specific elements. An element with greater stack order is always in front of another element with lower stack order.

p {
    position: relative;
    z-index: -1;

Negative stack orders can also be used in the same manner. A negative value will appear behind a more positive one. z-index only works on elements that have a position value (i.e. position: relative;). Like all other CSS properties, it can be set with JavaScript as well with the following syntax:

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