d3.select(selector) Selects the first element that matches the specified selector string. If no elements match the selector, returns an empty selection. If multiple elements match the selector, only the first matching element (in document order) will be selected. For example, to select the first anchor element: var anchor = d3.select("a"); If the selector is not a string, instead selects the specified node; this is useful if you already have a reference to a node, such as this within an event

d3.schemeSet1 An array of nine categorical colors represented as RGB hexadecimal strings.

d3.schemeSet3 An array of twelve categorical colors represented as RGB hexadecimal strings.

d3.schemePastel1 An array of nine categorical colors represented as RGB hexadecimal strings.

d3.schemeCategory20c An array of twenty categorical colors represented as RGB hexadecimal strings. This color scale includes color specifications and designs developed by Cynthia Brewer (colorbrewer2.org).

d3.schemeDark2 An array of eight categorical colors represented as RGB hexadecimal strings.

d3.schemePaired An array of twelve categorical colors represented as RGB hexadecimal strings.

d3.schemePastel2 An array of eight categorical colors represented as RGB hexadecimal strings.

d3.schemeCategory10 An array of ten categorical colors represented as RGB hexadecimal strings.

d3.schemeCategory20 An array of twenty categorical colors represented as RGB hexadecimal strings.