If an Ajax-capable browser submits this form, Prototype will intercept the submission and turn it into an Ajax call. This call will be send along with "Accept: text/javascript, text/html, application/xml, text/xml */*", which specifies a preference order where Javascript is first, if not available, then HTML, if not, then XML, and finally it'll accept whatever if none of the preferred forms are available.
Notice how the Prototype preference order doesn't match the order of declarations in the respond_to call. That order was significant when */* was used as the Accept header, but when preferences are available, we';; do multiple passes through the declaration in search of a match. The order of declarations won't matter unless neither Javascript, HTML, nor XML is found.
It's those hacks and ideas that are now able to blossom through the (re-)discovery of the wonderful Accept header in the HTTP specification.
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