The elevation adjustment that the parent imposes on this node.
The elevation property is relative to the elevation of the parent SemanticsNode. However, as SemanticsConfigurations from various ascending RenderObjects are merged into each other to form that SemanticsNode the parent’s elevation may change. This requires an adjustment of the child’s relative elevation which is represented by this value.
The value is rarely accessed directly. Instead, for most use cases the elevation value should be used, which includes this adjustment.