A standalone D3 scatter plot.
This is example 106 of the screencast Introduction to D3
forked from curran's block: Standalone Scatter Plot
forked from uicoded's block: Standalone Scatter Plot
forked from uicoded's block: Standalone Scatter Plot
forked from uicoded's block: MPG vs Cost
https://cdn.jsdelivr.net/npm/d3@3.5.17/d3.min.js