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  • That's a good point. And yet ActionScript managed it, by simply putting out a new version. When defining you script tag, you've always been able to specify JavaScript version, so "breaking" existing sites should be a non-issue. Commented May 27, 2011 at 13:09
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    In practice most script tags on the net do not have a version number. To be honest I'm not sure of all the issues on this one, but I do know that the folks that think about this stuff have decided that it is not doable. Commented May 27, 2011 at 14:12
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    @Tom: Adobe also has full control over the Flash platform. No one entity has full control over all the JS platforms out there. Also, simply tacking on a version number for a JS script in a browser would mean you either are not supporting older browsers or have to write two scripts. So, it is an issue. Commented May 31, 2011 at 14:20