Lifted directly from: http://gis.stackexchange.com/questions/44928/what-is-the-default-projection-in-leaflet
“Leaflet’s default projection is EPSG:3857, also known as “Google Mercator” or “Web Mercator” and sometimes designated with the number “900913”. This projection is what most slippy tile based maps use, including the common tile sets from Google, Bing, OpenStreetMap, and others. You can easily use this projection in QGIS by selecting “Google Meractor EPSG:900913”. Leaflet has some basic support for displaying maps in other projections. Most folks who do that seem to use the addon Proj4Leaflet to perform the projection.“
AJG-Develop 
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