- Different between selection.attr() and select.style()
- Thinking about joins. For instance, you’re making a basic scatterplot using D3, and you need to create some SVG circle elements to visualize your data, i.e. many circles.
- Click-able node: Make the nodes in a graph or complex network click-able.
- Add tooltips, or through contextual menu popup (here, here and here).
- Add hyperlink.