Comment by extra88

Especially when you don't approach it that way; they made an HTML game in desktop Chrome then worked on getting it to work in various mobile browsers, including quite old ones.

The article gets to the right conclusion, develop mobile first. I'd put it more generally as develop for the most constrained devices you intend to support. If they had done so, it would have saved a lot of time (some of their expectations about APIs still would not have been met).