With latest nightly / trunk, <output> can be invalid but it doesn't block the form submission.
The specs say that only submittable elements should block the submissions but all non-submittable elements (except output now) that barred from constraint validation. I think it's safe to have all listed and non-listed elements being able to block the submission.
Assignee: nobody → mounir.lamouri
Status: NEW → ASSIGNED
Attachment #491567 - Flags: review?(jonas)
This is fixing a test.
Status: ASSIGNED → RESOLVED
Last Resolved: 9 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla2.0b8
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