It replaces most (but not all) of the javascript. So you can manipulate dom elements, draw to a canvas, etc. There is still some javascript requirement as the

It replaces most (but not all) of the javascript. So you can manipulate dom elements, draw to a canvas, etc. There is still some javascript requirement as the wasm approach generally needs some JS setup bits in order to have things work. Languages that can compile to wasm should already have that pretty well figured out by this stage though. In theory. ;)