autocomplete="off" is an unrecognized attribute according to the HTML specifications. It was originally created by Microsoft (one of their better ideas) and has been adopted by all major modern browsers other than Opera (they have a strange stance on this one).
The validation error is competely harmless in that conformant HTML parsers are supposed to ignore unknown attributes. I have no hesitation in using this attribute where required, and I wouldn't reduce user experience to achieve validity.
Now validates html.
[edited by: tedster at 8:34 pm (utc) on June 15, 2005] [edit reason] remove link [/edit]