billboard.js 3.12 release: new funnel chart!
Briefly

A funnel chart is a graphical representation where each area gets narrower, illustrating data progression through sequential steps or stages.
The new version allows easy generation of funnel charts by specifying the chart type and provides a 'neck' option to adjust the bottom narrowed area's neck.
The axis.tooltip option helps users notice the current position's coordinate value according to its axes value, aiding in recognizing precise points during chart interaction.
In cases where multiple x axes are used, the axis.x.forceAsSingle option ensures that tooltip events will work effectively near the data points, making interaction based on x axis value more manageable.
Read at Medium
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