2019 It seems autocomplete="disabled" works again as of Chrome 72.
SINCE A LOT OF PEOPLE HAVE BEEN DOWNVOTING WITHOUT READING THE COMMENTS:
THIS NO LONGER WORKS IN CHROME AS OF 2018 / CHROME 63+
relevant: https://bugs.chromium.org/p/chromium/issues/detail?id=587466
Having autocomplete="false" instead of autocomplete="off" works, you can read more from the Chrome team as to why they did it
here:
https://www.chromium.org/developers/design-documents/form-styles-that-chromium-understands
https://bugs.chromium.org/p/chromium/issues/detail?id=468153
https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/zhhj7hCip5c
https://developers.google.com/web/updates/2015/06/checkout-faster-with-autofill
