title: Explanation of Leaflet Custom Icon LatLng vs XY Coordinates
body: <p>Can someone provide an explanation on how to use the Leaflet Marker Icon XY Coordinates listed here:
  <a href="http://leafletjs.com/examples/custom-icons/" rel="noreferrer">http://leafletjs.com/examples/custom-icons/</a></p>
  
  <p>Is lng/lat directly mapped to x/y? For example, sometimes in game engines, the Y pixel increases in value, but goes <strong>down</strong> the page.
  Here is it the same? I can't quite wrap my head around it.</p>