z-index
Sets the stack order of a positioned element. Elements with a higher z-index are always in front of an element with a lower z-index.
It is documented as part of the CSS Positioned Layout specification.
Syntax
/* Usage Example */
.modal {
position: fixed;
z-index: 9999;
/* ensures the modal stays on top of everything else */
}
/* Syntax */
z-index: auto;
/* Global values */
z-index: inherit;
z-index: initial;
z-index: revert;
z-index: revert-layer;
z-index: unset;z-index Browser support
Widely available
Since
2015 96% global usage
This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.
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