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Specification: http://www.whatwg.org/specs/web-apps/current-work/multipage/forms.html Multipage: http://www.whatwg.org/C#client-side-form-validation Complete: http://www.whatwg.org/c#client-side-form-validation Referrer: http://www.whatwg.org/specs/web-apps/current-work/multipage/ Comment: Section Note has some inconsistency with spec In the note it says "invalid events are fired ... then at the form element itself." But in section 4.10.21.2 it only says "invalid controls" should fire an "invalid" event, but not a form element. Posted from: 210.22.122.2 User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:33.0) Gecko/20100101 Firefox/33.0
The event is fired on the <form> element in form submission: http://whatwg.org/html#form-submission-algorithm:event-invalid