Is there a way to tell which version of OpenFl was used in a html5 build from the files generated by the build?
Sure! You can
haxe.macro.Compiler.getDefine to cook any defined Haxe value into the compiled output:
import haxe.macro.Compiler; ... var openflVersion = Compiler.getDefine("openfl");
I was asking for builds that have already been made. And I was able to find it. The debug.hxml file in the html5/haxe folder contains these lines:
I was looking only in the files in the bin folder which is the actual html5 folder created by a build.