These elements are focusable but either invisible or obscured by another element
This test is given a false positive in (almost) every site I've tried. You can try running the audit in this very site or http://getbootstrap.com/ or https://www.southwest.com/.
I'm seeing this as well, but strangely only in certain build environments (cannot reproduce locally, can reproduce in TravisCI -- same versions of phantomjs, ruby, etc.).
On 12 Nov 2015 07:55, Wenbolovesnz firstname.lastname@example.org wrote:+1
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I believe I'm seeing the same issue with a fixed header, where all elements are accessible via keyboard and mouse.
Bump with some info. I am able to repro with a simple case of pushing a link down below the fold.
Auditing that demo page consistently gives me the AX_FOCUS_01 warning. Making the super-tall div shorter so the link stays above the fold removes the warning.