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In other word, if we have: <form id='a'></form> <fieldset form='a'> <input> </fieldset> The input element should be associated the form 'a'. I'm not sure if we should ignore <input form='b'> or allow it. See this Mozilla bug: https://bugzilla.mozilla.org/show_bug.cgi?id=755215
This bug was cloned to create bug 17872 as part of operation convergence.
HTML5.1 Bugzilla Bug Triage: It looks like in the WHATWG spinoff thread, there was consensus to Won't Fix. Given that I'll apply the same resolution here. If this resolution is not satisfactory, please copy the relevant bug details/proposal into a new issue at the W3C HTML5 Issue tracker: https://github.com/w3c/html/issues/new where it will be re-triaged. Thanks!