var areaA = document.getElementById('area-a');var areaB = document.getElementById('area-b');
areaC = document.getElementById('area-c');splitter.Split(Splitter.Side.A, Splitter.Direction.Horizontal,
areaC);
+----------+ +----------+
| element | | A |
| | -> +----------+
| | | B |
+----------+ +----------+
+----------+ +----+-----+
| element | | | |
| | -> | A | B |
| | | | |
+----------+ +----+-----+