Add support for the autofill anchor mantle

[dylanb]

Expectation: disallow the on and the off values for input fields that have the autocomplete attribute AND are type="hidden" because these fields are intended to provide the browser with information to help with the filling out of the visible form fields. Non-conforming use of the autocomplete attribute could interfere with this.

Actual: We currently do not differentiate between hidden and normal fields in the common function AND we filter out hidden fields in the matches function

Motivation: This will provide a more useful rule for correct autocomplete usage

axe-core version: 3.1.2

[WilcoFiers]

@dylanb I do not really understand how having autocomplete on an input[type=hidden] field is an accessibility problem, at least not without false positives. Can you explain?

[WilcoFiers]

Haven't had a response in 10 months. Closing the issue. Feel free to reopen if you want us to look into it again.