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<iframe allowTransparency> is a proprietary IE feature that is apparently used on some sites. It is not mentioned in the obsolete section. It's also not clear whether it would help interoperability to give it a rendering effect. It was hard for me to understand what it even does.
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 r4968. Check-in comment: <iframe allowtransparency> is apparently obsolete (in that it existed once somewhere, and is not conforming) http://html5.org/tools/web-apps-tracker?from=4967&to=4968