Vega-Lite - a high-level grammar for statistical graphics. Vega-Lite provides a higher-level grammar for visual analysis, comparable to ggplot or Tableau, that generates complete Vega specifications. Vega-Lite specifications consist of simple mappings of variables in a data set to visual encoding channels such as x, y, color, and size. These mappings are then translated into detailed visualization specifications in the form of Vega specification language. Vega-Lite produces default values for visualization components (e.g., scales, axes, and legends) in the output Vega specification using a rule-based approach, but users can explicit specify these properties to override default values.