A facet is a trellis plot (or small multiple) of a series of similar plots that displays different subsets of the same data, facilitating comparison across subsets.
To superimpose one chart on top of another.
Vega-Lite specifications are JSON objects that describe a diverse range of interactive visualizations.
Single view specification, which describes a view that uses a single mark type to visualize the data.
All view composition specifications (layer, facet, concat, and repeat) can have the resolve property for scale, axes, and legend resolution.
all view layout composition (facet, concat, and repeat) can have the following layout properties: align, bounds, center, spacing.
JavaFX WebView with vega-lite plot.