WebAssembly is a new, portable, low-level bytecode format for the web. It is the result of a collaboration of a large constellation of players from many companies and academia and opens a wide world of new possibilities for applications on the web. This talk will cover the history of WebAssembly from two its principal inventors and offer a (hopefully) fascinating view into the makings of a major web platform change. We’ll offer our personal perspectives and struggles, as well as cover today’s developments in WebAssembly and our hope for its future.