A bare minimum HTML page demonstrating use of CSS and JavaScript.

See also React Starter. .classifMethod("threshold") .color(d3.interpolateBlues)

        .threshold([  5,10, 15,20,25, 30,35,40, 45 ])
         d3.scaleSequential( = d3.scaleSequential(d3.interpolateRdYlBu).domain([1, 45]);