Bug#871634: [a11y] better/different handling needed for onfocus blur

[Raphaël POITEVIN]

Package: firefox
Version: 55.0-1
Tags: a11y upstream
Owner: bugs at hypra.fr
User: bugs at hypra.fr
Usertags: hypra
Forwarded: https://bugzilla.mozilla.org/show_bug.cgi?id=422981

DESCRIPTION FROM UPSTREAM:

"

> Steps to reproduce:
>
> 1. View the attached test case.
> 2. Use Tab to move focus from link to link
>
> Expected results:  You'd be able to use Tab to move focus to all of 
> the links.
>
> Actual results:  You are not able to use Tab to move past the fourth 
> link; focus cycles back to the top of the page.
>
> Comments:
>
> I realize that *technically* this is not a FF bug:  People (united.com 
> for example) apparently have some reason for wanting to remove focus 
> from an object which was just given focus, and FF is certainly doing 
> that. :-)  However, it poses a very serious accessibility problem for 
> users with visual impairments using the keyboard to navigate among 
> focusable objects.
>
> If it were just united.com where this behavior was present, the 
> logical thing to do would be to bother them about the inaccessibility 
> of their site.  Unfortunately, a bit of searching found plenty of 
> other sites using this technique. Therefore, I'm wondering if the 
> behavior that results from an onfocus blur could be modified within 
> Firefox.
>
> I discussed this issue with Marco and he had an interesting idea, 
> namely rather than giving focus back to the document frame, give focus 
> to the next focusable object.  That would, I think solve the problem.
>
> Thanks in advance for looking at this!
"