Re: Nested links (not related to children presentational issue in ARIA 1.1)

Hi Marco,

The question is should nested links be allowed in SVG? Here is a link to
the git issue. If not, why? Do AT have problems with it?...

                                                              
     Regards,                                                 
                                                              
    Fred Esch                                                 
 Watson, IBM, W3C                                             
  Accessibility                                               
                                                              
 IBM Watson       Watson Release Management and Quality       
                                                              






From: Marco Zehe <mzehe@mozilla.com>
To: Birkir Gunnarsson <birkir.gunnarsson@deque.com>
Cc: Shane McCarron <shane@spec-ops.io>, Michael Cooper
            <cooper@w3.org>, Richard Schwerdtfeger <richschwer@gmail.com>,
            Fred Esch/Arlington/IBM@IBMUS, ARIA <public-aria@w3.org>
Date: 06/23/2016 10:52 AM
Subject: Re: Nested links (not related to children presentational issue
            in ARIA 1.1)



I did a quick test with the example given, and none of the 3 browsers I
tested (Firefox, Chrome, IE 11) actually nest the links. They simply
consider the two links separate entities at the same level, considering the
second opening a tag the closure of the previous, and ignoring the final
closing one. There are two accessible objects, and they are not nested.

So in my opinion, there is no indication that browsers, at least on
Windows, support nested links, they just make one believe so by accounting
for such obvious author error. So I don't see why we should allow or even
vote for nested links. As was put forward by Shane, nestee links even
violate the HTML 5.1 specification. So nothing to duplicate, other than the
parser accounting for the same nesting error and separating them out into
separate links at the same level.

Marco


2016-06-23 16:15 GMT+02:00 Birkir Gunnarsson <birkir.gunnarsson@deque.com>:
  Agreed, this constitutes a WCAG 4.1.1 violation for HTML:


  “elements are nested according to their specifications”


  The HTML Nu Validator https://validator.w3.org/nu/



  returns 2 errors for a nested link construct.


  <a href=http://www.apple.com>Apple


  <a href=”http://www.google.com”>Google</a>


  </a>


  “Error: Start tag a seen but an element of the same type was already
  open.”


  And


  Error: Stray end tag a.














  From: Shane McCarron [mailto:shane@spec-ops.io]
  Sent: Thursday, June 23, 2016 9:58 AM
  To: Michael Cooper <cooper@w3.org>
  Cc: Richard Schwerdtfeger <richschwer@gmail.com>; Fred Esch <
  fesch@us.ibm.com>; ARIA <public-aria@w3.org>
  Subject: Re: Nested links (not related to children presentational issue
  in ARIA 1.1)











  On Thu, Jun 23, 2016 at 8:50 AM, Michael Cooper <cooper@w3.org> wrote:


  This thread was started on ARIA Admin, but it should be on the main WG
  list since it's a technical discussion. Attempting to move it with this
  message. Michael





  On 23/06/2016 9:47 AM, Richard Schwerdtfeger wrote:
        Nested links work in HTML browsers now. I don’t think they should
        be prohibited in SVG. The closer we align SVG and HTML the better
        it will be for developers.








  No - they are expressly prohibited.  I mean - a browser might support it,
  but that behavior is undefined and the content is invalid:
  https://www.w3.org/TR/html51/textlevel-semantics.html#elementdef-a



  --


  Shane McCarron


  Projects Manager, Spec-Ops