Like the novalidate attribute form form elements, it lets the author to specify the form will not be validate when submitted with a specific submit control.
This should be a blocker for 2.0. Even if it's probably less important than bug 556013, it would be better to ship form validation with this attribute to disable it.
Jonas sets formnovalidate for beta6 so maybe we should move this one for beta6 too?
Created attachment 473344 [details] [diff] [review]
Comment on attachment 473344 [details] [diff] [review]
Terrible attribute name, but that is what the HTML5 draft has.