I feel that it's worth mentioning that Kay and others believe the web browser has a fundamental flaw: you send data formats that the browser interprets rather t

I feel that it's worth mentioning that Kay and others believe the web browser has a fundamental flaw: you send data formats that the browser interprets rather than self contained "objects" that know how to execute themselves. This is why we've been stuck with tech like CSS, JavaScript, and HTML and it's so hard to break out. Their version of a browser would likely be an address bar with the ability to safely run arbitrary programs (objects) in the space below. HTML, CSS, and JS would be special cases of this.