Where is the "box" part of EditorGUILayout.BeginVertical("box") documented?

Where is the “box” part of EditorGUILayout.BeginVertical(“box”) documented?

Are there other key strings?

Most items you see with the phrasing “Makes” in the description will work in GUILayout

//Auto fit styles:
EditorGUILayout.BeginVertical("Box");
EditorGUILayout.BeginVertical("Button");
EditorGUILayout.BeginVertical("TextArea");
EditorGUILayout.BeginVertical("Window");
EditorGUILayout.BeginVertical("Textfield");

EditorGUILayout.BeginVertical("HorizontalScrollbar"); //Fixed height
EditorGUILayout.BeginVertical("Label"); //No style
EditorGUILayout.BeginVertical("Toggle"); //Just puts a non usable CB to the left 
EditorGUILayout.BeginVertical("Toolbar"); //Fixed height