False positive AX_FOCUS_01 when control is inside shadow root.

[dzhioev]

Here is a repro page: http://dzhioev.net:8080/shadow_focusable_obscured.html
My browser: Google Chrome 45.0.2427.7 (Official Build) dev

Audit thinks that <button> is obscured by <x-foo>, which is not true. Actually <button> is inside <x-foo>'s shadow root.
Looks like patch master...dzhioev:patch-1 solves the issue.

[alice]

Thanks for looking into this! Would you be interested in making a PR for that change?

If so, could you please add a test for the issue (presumably based on that repro page)? If you'd rather not, would it be ok if I pulled that change into my own repo to create a PR?

[dzhioev]

Sorry, I don't have time for that. Also I'm not sure that my patch is good enough (maybe axs.utils.parentElement should be used instead of node.parentNode || node.host, don't know). You can use my patch and repro page, if you want to.