If true the node's Z-index is relative to its parent's Z-index. If this node's Z-index is 2 and its parent's effective Z-index is 3, then this node's effective Z-index will be 2 + 3 = 5.
See Implementation
If true the node's Z-index is relative to its parent's Z-index. If this node's Z-index is 2 and its parent's effective Z-index is 3, then this node's effective Z-index will be 2 + 3 = 5.