form.enctype / encoding / method should treat null as "null" string: - https://html.spec.whatwg.org/multipage/forms.html#htmlformelement Currently, WebKit treats null as the null String, which ends up removing the existing attribute. Firefox and Chrome match the specification.
Created attachment 283976 [details] Patch
Comment on attachment 283976 [details] Patch Clearing flags on attachment: 283976 Committed r203401: <http://trac.webkit.org/changeset/203401>
All reviewed patches have been landed. Closing bug.