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Yep, the same, both fields exist.. but I hope to cheat google as I remove "type=hidden". In all cases this warnings are improper, but are real and may harm our sites, for seo at least.
First I checked hows on in wordpress, they have removed "hidden", not exist in any field. Than I decide to remove it also, I dont know, maybe google just hate this word "hidden" :)
For browser version, I dont know what is actual, I use only firefox, but this security warning (in gwt) was only few days ago.
OK Im good tester and will test what will happen with "display:none" :)