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In the description of the iframe element it says "If the itemprop is specified on an iframe element, then the src attribute must also be specified." This should be in the Microdata spec instead.
Likely got in through a patch of mine. I'll take care of it. Thanks for noticing.
Staged as: https://github.com/w3c/html/commit/1969df7326ccdaa94acf13ae56f3d069bba747cf
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-v2.html Status: Accepted Change Description: https://github.com/w3c/html/commit/1969df7326ccdaa94acf13ae56f3d069bba747cf Rationale: Microdata references are not used in the W3C spec