NewtonScript had a neat concept of heterogeneous multiple inheritance: Its "objects" had a prototype-like inheritance chain and a container inheritance chain.

NewtonScript had a neat concept of heterogeneous multiple inheritance: Its "objects" had a prototype-like inheritance chain and a container inheritance chain. If client-side JavaScript had this design, there would be no need for the DOM to have a special event mechanism that lives outside of method handling: DOM elements would simply have method handlers and the dispatch system would handle prototype and container inheritance.