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In the Features page, it may be quite difficult to fully understand the layout of a theme.json file, especially for a beginner.

The CSSLoader team has made a web visualizer to help understand all features CSSLoader has to offer. Importing and Exporting .json files is supported. Feel free to import the examples from the Features page, and see how they work. Feel free to also modify these examples, export the .json, and re-use them for your own themes.

Dependencies are currently not configurable trough the Visualizer

You can also access the site here

The source code for the visualizer can be found here