They tend to have a little less American diplomat blood though

OK, I fully admit the history of javascript is something I'm not extremely knowledgeable about. I also am aware people are using javascript outside of the browser these days. However, since to date, javascript is primarily a browser based language, why don't they use some of the fundamentals that the browsers use? Simply, make the new version (and future versions) declare their version to the browser, and the browser can then handle how to run. Microsoft can treat it like a new language, Mozilla can handle it they way they want to, and people running older browsers will be oblivious to it all (as long as however it identifies itself doesn't break the previous version). So the new version would have something like //ECMAScriptv4.00 at the top of every line of javascript that needs the new interpreter. True, we spend more bandwidth, but in todays age of gzip compression everywhere, is it really going to matter?