The Legend widget displays labels and symbols for layers in the scene. It supports FeatureLayer, SceneLayer, MapImageLayer, and TileLayer. The legend automatically updates when the visibility of a layer or sublayer changes.
Caution:
Currently 3D symbols with more than one symbol layer are not supported, and the size in volumetric 3D symbols, such as polygon extrusion, is not depicted by the Legend widget. See JSAPI Legend for more information.
Configure the Legend widget
This widget can be set to open automatically when
an app starts. To enable this feature, click the Open this widget automatically when
the app starts button 
on the widget, which turns it dark
green.
There is no configuration for the Legend widget.
Use the Legend widget
To use the Legend widget, do the following:
- When the app starts, click the Legend widget to open the Legend window.
- To close the Legend window, click the close button (x) in the upper-right corner of the window.