Holds CSS stacking information. Works like CSS z-index, but for components that may not have an ancestor-descendant
relationship in the actual DOM (i.e. one uses React.createPortal). For example, the <Modal> component has a
higher CSS z-index than the <DialogBox> component, but if the modal opens a dialog box, the dialog box should be
displayed above the modal.
Holds CSS stacking information. Works like CSS
z-index, but for components that may not have an ancestor-descendant relationship in the actual DOM (i.e. one usesReact.createPortal). For example, the<Modal>component has a higher CSSz-indexthan the<DialogBox>component, but if the modal opens a dialog box, the dialog box should be displayed above the modal.