A big news in 4.9 is a better support of WebGL. Now WebGL is turned on as default.
I am wondering how do I know that my solution is using WebGL? Is there any function in JS API which can answer me that WebGL is activated and work properly?
My solution uses ArcGIS Server 10.6.1.
Is there any checklist from Esri where I can verify everything I need to have and do for WebGL activation?