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Besides the problem with not being able to pick the default submit button (which I think we have recorded somehow for addressing at some point in the future when HTML forms support is more complete), I'm not sure if we have the request on the record for identifying the submit button the user used. The submit event is dispatched on the form element and there is no way provided to identify which submit button was actually used. If you want to handle the form on the client that would be useful and should probably have been part of HTML forms since, well, long ago.
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: Partially Accepted Change Description: see diff given below Rationale: Fair enough. Marking LATER for now.
(In reply to comment #1) > Status: Partially Accepted > Change Description: see diff given below I guess something went wrong: whether you didn't meant that or you forgot to put the diff's link.