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Author cvrebert
Recipients cvrebert, giampaolo.rodola, jcea, r.david.murray
Date 2012-10-28.06:10:28
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AFAICT, there is currently no entry for WebM in IANA's registry ( ).
A bug in WebM's tracker regarding its MIME type(s) was closed over a year ago as WONTFIX ( ).

Giampaolo has already pointed out the relevant part of the WebM spec. WebM itself has no RFCs (there are 2 relating to VP8, its video codec, but they don't have anything that's relevant here).

To independently corroborate the existence of the MIME type, we have the following:

Mozilla, Microsoft, and Opera all acknowledge the MIME type in question:

The de-facto *nix MIME type database/package maintained by includes it:
Date User Action Args
2012-10-28 06:10:28cvrebertsetrecipients: + cvrebert, jcea, giampaolo.rodola, r.david.murray
2012-10-28 06:10:28cvrebertsetmessageid: <>
2012-10-28 06:10:28cvrebertlinkissue16329 messages
2012-10-28 06:10:28cvrebertcreate