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Radio buttons can be grouped using the @radiogroup attribute. The algorithm described seems to require that radiobuttons with the same radiogroup have the same parent. This is not required of <input type=radio> now, and it's pretty common for them not to have the same parent. Why is this required?
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: Rejected Change Description: no spec change Rationale: I assume you are referring to the <command> element. If so, then the requirement is to ensure that context menus remain accessible, since having different context menus be involved in the same radio menuitem set would be an accessibility and usability nightmare.
Per the proposal at http://lists.w3.org/Archives/Public/public-html-a11y/2010Jan/0245.html, the HTML A11Y TF does not plan to formally work on this issue at this time. This does not mean the TF has no interest in it, but does not have immediate plans to work on it. The TF may review the issue in the future.