D3: Tutorial - Scale graph - Ivan Teoh
www.ivanteoh.com/posts/176-d3-tutorial-scale-graph
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
This tutorial were going to create a basic dot graph with scalable y-axis. It is adapted from one of the examples in D3, dot.html.