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It seems that the "empty" step should run even if the UA is not processing the iframes' attributes for the first time Apply fix from WHATWG bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=18664 See tests in bug. This will apply the following WHATWG patch: https://github.com/w3c/html/commit/ce8d6f4510ca1b5e18a476b72f2553fb7399b6e4
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/ce8d6f4510ca1b5e18a476b72f2553fb7399b6e4 Rationale: accepted WHATWG change