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A mark object is a close mapping to a vega mark object. Vega marks are documented in https://github.com/trifacta/vega/wiki/Marks.
mark(type, props, data)is.mark(x)
is.mark(x)
A string with the vega type.
A list of properties, created by props.
props
A reactive data object.
This function is designed to be used by authors of new types of mark.