About the Web Map Specification
Web maps are sharable 2D maps hosted on the ArcGIS Platform. The Web Map Specification describes the JSON object which defines a web map. Adhering to the web map specification allows your applications to create, edit, and render any web map hosted on the ArcGIS Platform. For a more general overview of web maps, refer to Introduction to Web Maps.
If you're interested in learning more about the Web Map Specification, get started by reading about the top level structure of the web map object.
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