There's no "disable-autofill" value for the attribute in the specification:
https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#autofill
Try the spec-compliant "off" value. 

See the comment in the following bug:

https://bugs.chromium.org/p/chromium/issues/detail?id=468153#c164

---- quoted text ----
As an example, if you have an address input field in your CRM tool that you don't want Chrome to Autofill, you can give it semantic meaning that makes sense relative to what you're asking for: e.g. autocomplete="new-user-street-address".  If Chrome encounters that, it won't try and autofill the field.
---- end quoted text ----

Just that, instead of using "new-user-street-address", I'm using a different value. The behavior the same - i.e. it won't work with "new-user-street-address" either.

bigdogs30@ - Thanks for filing the issue...!!

Could you please provide a sample URL or test file to test the issue from TE-end.
This will help us in triaging the issue further.

Thanks...!!

The working and bugged code is in the original message but here are a couple of copy-pasted URLs

Working - https://jsfiddle.net/soj9m6dv/
Bugged - https://jsfiddle.net/oxgrn2kq/
Another bugged one that more closely follows the Chromium guidance from the article linked above - https://jsfiddle.net/tv69h4jv/

Thank you for providing more feedback. Adding requester "krajshree@chromium.org" to the cc list and removing "Needs-Feedback" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

@ bigdogs30 -- Thanks for providing the sample URL’s.

But, from the URL’s provided, which is mentioned as ‘Buggy’ seems to be working and the URL’s which is mentioned as ‘Working’ seems to be not working. Attached the screen-cast of the same. Could you please check and let us know if we have missed anything.

Thanks in advance.

Deleted: 741089.webm 5.1 MB

	741089.webm 5.1 MB View Download

The URLs are correct. The behavior is that, when the auto-complete attribute is set to a value that is unrecognized by Chrome, the auto-fill functionality is suppressed. That is what the https://jsfiddle.net/soj9m6dv/ link does.

If I use JavaScript to set the auto-complete attribute to the same value as if it is hard-coded into the HTML (i.e. one unrecognized by Chrome), the auto-fill functionality should be suppressed (as in the first example) but it is not (i.e. it activates). That is what the https://jsfiddle.net/oxgrn2kq/ link does.

The third link also should suppress the auto-fill behavior but doesn't.

In short, the auto-fill behavior should be suppressed on ALL of the links provided (i.e all the links should do the same thing) but is only suppressed on the first. The video that you provided accurately demonstrates this behavior. 

To be perfectly clear, I do not want the auto-fill behavior to activate. Only the first URL accomplishes that goal although all three should.

Thank you for providing more feedback. Adding requester "pnangunoori@chromium.org" to the cc list and removing "Needs-Feedback" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Able to reproduce the issue on Windows 10, mac 10.12.6 and Ubuntu 14.04 using chrome reported version #59.0.3071.115 and latest canary #62.0.3166.0.

Bisect Information:
=====================
Good build: 59.0.3041.0    Revision(456562)
Bad Build : 59.0.3042.0    Revision(456934)

Change Log URL: 
https://chromium.googlesource.com/chromium/src/+log/96ff8f1f6f00e57db01f58b3bbc4ee0fe3e90ee7..7eaf2657fde72f7cc64482cfb0d701bbaf34648a

From the above change log suspecting below change
Review url: https://codereview.chromium.org/2730383003

sense@ - Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

Note: ccing one of the reviewer as the owner doesn't own chromium id. 

Thanks...!!

This bug has an owner, thus, it's been triaged. Changing status to "assigned".