No direct DOM access

WebAssembly is unable to access the DOM, so any DOM manipulation needs to be done indirectly through JavaScript or using a tool such as Emscripten. There are plans to add the ability to reference DOM and other Web API objects directly, but that's still in the proposal phase. DOM manipulation will likely go hand in hand with GC languages, since it will allow the seamless passing of objects between WebAssembly and JavaScript code.