The JavaScript InfoVis Toolkit provides tools for creating Interactive Data Visualizations for the Web
The "Cushioned Treemaps" option is not an actual cushioned map that follows the algorithm as spelled out in http://www.win.tue.nl/~vanwijk/ctm.pdf . It's currently just a gradient that doesnt really offer any additional value over a flat map. The formula presented in the cushioned treemap paper gives the viewer a high level impression of the underlying hierarchy. It would be pretty awesome if this library supported the actual algorithm that generates those gradients (for examples, see windirstat/disk inventory X/ or Kdirstat - they all implement the algorithm).
This issue appears to be discussing a feature request or bug report related to the repository. Based on the content, it seems to be still under discussion. The issue was opened by ryanaslett and has received 0 comments.