The IM case can be done without JS, actually, using chunked encoding [1]. This is similar to the MIME multipart/x-mixed-replace technique [2] that was used for

The IM case can be done without JS, actually, using chunked encoding [1]. This is similar to the MIME multipart/x-mixed-replace technique [2] that was used for "streaming" webcams in the late 90s. [1] http://en.wikipedia.org/wiki/Chunked_transfer_encoding http://en.wikipedia.org/wiki/Chunked_transfer_encoding [2] http://en.wikipedia.org/wiki/MIME#Mixed-Replace http://en.wikipedia.org/wiki/MIME#Mixed-Replace