This file shows how to use the conicConformalPortugal projection from d3-composite-projections. Since the world layer is used, note that the Iberian Peninsula is clipped at the projection border. These projections work well when used at the place they are intended for.
Modified http://d3js.org/d3.v3.min.js to a secure url
Modified http://d3js.org/topojson.v1.min.js to a secure url
Updated missing url https://cdnjs.cloudflare.com/ajax/libs/d3-composite-projections/0.3.5/conicConformalPortugal-proj.min.js to https://cdnjs.cloudflare.com/ajax/libs/d3-composite-projections/0.3.5/conicconformalportugal-proj.min.js
https://d3js.org/d3.v3.min.js
https://d3js.org/topojson.v1.min.js
https://cdnjs.cloudflare.com/ajax/libs/d3-composite-projections/0.3.5/conicConformalPortugal-proj.min.js