How is assembly going for you? What is fundamental to the web is the APIs (dom/websockets/webgl/...) not the fact that they are exposed through javascript. Dart seems especially nice considering that they go out of their way to provide (most?) html5 apis in dart and also Angular.

In fact the dom is defined in an IDL which can generate the dom API not only in javascript but a lot of other languages (Java/C++/etc)