CSS transform-style Property
The transform-style CSS property determines whether an element's children are positioned in 3D space or flattened in the element's plane. The element's children will not exist on their own in 3D space if it is flattened. Because this property is not inherited, it must be set for the element's non-leaf descendants.
|flat||This specifies that child elements will NOT retain their 3D position. This is the default setting.|
|preserve-3d||This specifies that child elements will keep their 3D position.|
|initial||This property is set to its default value.|
|inherit||This property is inherited from its parent element.|
|Property||Chrome||Firefox||Safari||Edge / IE||Opera|