JavaScript was originally used to specifically address the need for scripting inside of an HTML page, usually on the client-side (in a browser). As such, it was built to be able to manipulate HTML elements on the page. Several packages have been developed to further this feature, even for creating a web server, especially using extensions such as Node.js.
The use of any of the HTML manipulation and generation features inside of Jupyter runs into a roadblock, since Jupyter expects to control presentation to the user.
