Hi. In this post i will show you how to build Unreal Engine 4 ‘s HTML5 support.
When you downloaded these install Empscripten and github (spam next button)
And open github for windows and enter your account(or create a account)
Open git shell and write these
emsdk install latest
emsdk activate latest
Goto UE4 source code folder and press GenerateProjectFiles.bat and open Visual Studio
Pick HTML5 from platform list and build it.
Happy playing. :-P