MapPanes interface

google.maps.MapPanes interface

Properties
`floatPane`	Type: `Element` This pane contains the info window. It is above all map overlays. (Pane 4).
`mapPane`	Type: `Element` This pane is the lowest pane and is above the tiles. It does not receive DOM events. (Pane 0).
`markerLayer`	Type: `Element` This pane contains markers. It does not receive DOM events. (Pane 2).
`overlayLayer`	Type: `Element` This pane contains polylines, polygons, ground overlays and tile layer overlays. It does not receive DOM events. (Pane 1).
`overlayMouseTarget`	Type: `Element` This pane contains elements that receive DOM events. (Pane 3).