I tried to make the spine javascript runtime work on a higher DPI for retina screens. The common trick mentioned somewhere else on this forum: https://www.khronos.org/webgl/wiki/HandlingHighDPI
Sadly in the mentioned post on this forum, the discussion is not finished - and no answer is really given:
http://esotericsoftware.com/forum/how-to-make-webgl-exports-look-good-on-retina-screens-8004?p=37416&hilit=webgl+retina#p37416
I tried the trick mentioned by Khronos - which (as mentioned in the forum post) is automatically reversed by the Spine runtime. Was there any follow up somewhere else on the suggested overwriting of the widget.resize()?
I was wondering what the current recommended way is for allowing for retina screen on the spine WebGL context.