Not everything that needs interoperability can, nor should, use HTTP/HTML. For me, IoT includes very small devices still with only a few K of RAM, and requiring an HTTP/HTML stack in amongst everything else will just serve to push up prices and add needless complexity.
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W3C Multimodal Interaction standards
Not everything that needs interoperability can, nor should, use HTTP/HTML. For me, IoT includes very small devices still with only a few K of RAM, and requiring an HTTP/HTML stack in amongst everything else will just serve to push up prices and add needless complexity.