Build 4.26 integrating html build support

Hello guys.
I am making a game and for demo pourpose i want to use the html5 build making it easly accessible.
Now i am using 4.26 that doesn’t come with html by default. So i am trying to find a way to build it from the source integrating the html plugin.
But i cant figure out how to do. Can someone adress my to a tutorial or give me an idea of how can i do it???