title: Display a map and highlight certain countries
body: <p>Here's what I'm struggling to do :
  Display a map on page (Google map or any of it competitors, free is possible...) and highlight certain countries on this map (the list of theses countries would be stored in a variable by exemple).</p>
  
  <p>I tried to draw polygons on the map with a geo-json list of (almost) all the countries but it's too heavy.</p>
  
  <p>Any ideas ?</p>