observablehq / plot

The marks option now accepts render functions, null, and undefined as shorthand mark definitions. Nullish marks produce no output and are useful for conditional display (equivalent to the empty array). Render functions are invoked when plotting and may return an SVG element to insert into the plot, such as a legend or annotation.

The Plot.marks(...marks) function provides mark.plot shorthand for array marks. This is useful for composite marks, such as boxes.

All marks now support the shapeRendering option. (This is a constant; it may not vary across marks.) All marks now allow strokeWidth to be specified as a channel. (The strokeWidth channel is unscaled; values are specified in literal pixels.) Text marks now also allow stroke and strokeOpacity to be specified as channels. If its fill is not none, a line’s default stroke is now none rather than currentColor, making it consistent with dot and other marks. When a fill or fillOpacity channel is used with a link, or when a stroke or strokeOpacity channel is used with a rule, undefined values will now be filtered. The text mark now uses attributes instead of styles for font rendering properties, improving compatibility with Firefox.

Marks that represent continuous intervals (rect, bar, and rule) now handle collapsed domains during rendering. A domain is considered collapsed when it contains only a single value. A collapsed domain can occur when all input values to the bin transform are equal (e.g., [1, 1, 1, …] produces a domain of [1, 1]). Previously a collapsed domain would result in an invisible zero-width mark; now the mark spans the full extent of the chart.

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