The ArcGIS Maps SDK for JavaScript provides hundreds of 2D and 3D web style symbols out-of-the-box along with a variety of colorblind-friendly color ramps suitable for any background.
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Esri color ramps
Browse hundreds of sequential, diverging, and categorical color ramps you can copy/paste directly into your app.
Symbols
Learn about the various symbols and create your own custom symbol and generate the code to copy/paste directly in your app.
Esri Web Style Symbols (2D)
Browse hundreds of 2D web style symbols you can copy/paste directly into your app.
Esri Web Style Symbols (3D)
Browse hundreds of 3D web style symbols you can copy/paste directly into your app.