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"4.8.5 The object element ... The type attribute, if present, specifies the type of the resource. If present, the attribute must be a valid MIME type, optionally with parameters." But "valid MIME type" is defined earlier on as "A string is a valid MIME type if it matches the media-type rule defined in section 3.7 "Media Types" of RFC 2616. [HTTP]" ...which already allows parameters.
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the tracker issue; or you may create a tracker issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Accepted Change Description: see diff given below Rationale: Concurred with reporter's comments.
Checked in as WHATWG revision r4554. Check-in comment: Correct terminology regarding MIME types. http://html5.org/tools/web-apps-tracker?from=4553&to=4554