we have mp3, flac and wave
Is sound limited to full loading as well (IIRC you can't have progressive image loading using DT) ? If it's the case, such large sound data format datatype is quite useless... Who would wait 10-15 sec before his mp3 sound is loaded ? Btw, eating a whole 40Mb
Datatype was a good idea, but its concept needs to be extended for today's usage. I guess that's what Reaggae does (in addition to adding filters stuff and a lot more...).
As for webP, I had a quick look at their comparison page, and though I could have the same results by compressing PNG looseless files just a little more than they did. Then the quality is about the same, and even better...
Btw, one nice feature (at that time at least) was progressive loading: does webP support something like this ?