I've never encountered any autofill instance where the effects of autofill wasn't immediately apparent (usually it's just the username and password). Having a s

I've never encountered any autofill instance where the effects of autofill wasn't immediately apparent (usually it's just the username and password). Having a special hidden fields in your form seems like a Bad Idea, but what is worrying is that there is nothing stopping more devs from implementing something like this. The only reason why we don't see it more often is probably because it takes more effort to make a "smart" form like this.