Forwards-compatible syntax proposal

Mike Shaver mike.shaver at
Mon May 26 06:45:25 PDT 2008

On Mon, May 26, 2008 at 9:37 AM, Nathan de Vries <nathan at> wrote:
> i.e. Can a chunk of ES4 defined in a <script type="application/
> javascript;version=2" /> block interact with ES3 code defined in a
> <script type="application/javascript" /> block? Has this behaviour
> been decided on?

Yes, that's been a major part of the design of the language; toolkits
need to be able to upgrade to ES4 features without making the
consumers upgrade wholesale, and vice versa.
has an example of how ES4 and ES3 code styles interact, and splitting
the sample program into separate <script> blocks should work just as
well as it does in with ES3 today.


More information about the Es4-discuss mailing list