RE: ]RE: Relative Units for Font Size Scaling W3C requirement replaced by zoom techniques in new Browsers?

We need to be careful here.

ZOOM is being used in two different ways. To avoid this in WCAG we

1) use ZOOM to refer ONLY to a full image zoom.  It is like magnifying the
page (though sometimes font smoothing occurs)

2) use FONT SCALING or SIZING with WRAP to refer to changing the font size
in a way that causes relayout of the page - or staying within horizontal
width. (so there is no horizontal scrolling)

With ZOOM there should never be a layout integrity problem if a true ZOOM
since the layout is just magnified.

With RESIZING with WRAP  ( fluid layout etc)  then you do.


PS  I am not saying that everyone needs to use these definitions, just that
you need to remember them in interpreting the WCAG guidelines.



Gregg
 -- ------------------------------
Gregg C Vanderheiden Ph.D.



> -----Original Message-----
> From: wai-xtech-request@w3.org
> [mailto:wai-xtech-request@w3.org] On Behalf Of Charles McCathieNevile
> Sent: Friday, June 08, 2007 3:30 AM
> To: Loretta Guarino Reid; Schnabel, Stefan
> Cc: Gregg Vanderheiden; Cooperman, Michael J; Aaron M
> Leventhal; wai-xtech@w3.org
> Subject: Re: ]RE: Relative Units for Font Size Scaling W3C
> requirement replaced by zoom techniques in new Browsers?
>
>
> On Wed, 23 May 2007 17:43:29 +0200, Loretta Guarino Reid
> <lorettaguarino@google.com> wrote:
>
> >
> > On 5/23/07, Schnabel, Stefan <stefan.schnabel@sap.com> wrote:
>
> >> Advantage for Zoom is that it does enlarge images
> proportionally also.
>
> Indeed.
>
> >> Questions now:
> >>
> >> a) is Greggs Level AA rating when using zoom correct? Is
> that sufficient
> >> success criteria for W3C regarding font scaling?
> >
> > Whether such browser functionality can be used to satisfy this AA
> > success criterion depends upon which browsers are used by the target
> > audience. If only IE7 supports zoom and your users are not
> using IE7,
> > you need to use other techniques such as scalable fonts.
>
> In fact IE7 is one of the last browsers to do zoom - only
> about a decade
> after it started appearing in browsers. On the other hand, I
> only know of
> a couple of mobile browsers that provide zoom, and I suspect
> it is still
> an issue for now.
>
> >> b) will the sections that reccommend to use em units be
> modified to
> >> reflect new zooming techniques in browsers?
> >
> > No,  using scalable fonts is still a sufficient technique to satisfy
> > this success criterion.
> >
> >> b) is horizontal scrolling when using zoom a no-go for
> accessibility or
> >> is it more a usability issue and a consequecne of AA
> classification?
> >
> > It is an accessibility issue, which is why it is included in WCAG.
> > However, there is some content for which it will not be possible to
> > scale the content in a way that doesn't require horizontal scaling
> > (e.g. large complex data tables).
>
> Well, using a table transformation tool it is possible to
> avoid it, but
> people don't generally do that :( On the other hand using
> something like
> fit-to-width in combination with zoom wil deal with some of
> the issue - by
> breaking anything that you used to try and force your site to
> maintain a
> particular layout. Adaptive layout is still an important
> technique for
> users, so building a layout that can handle being adapted is
> a pretty good
> idea.
>
> cheers
>
> chaals
>
> --
>    Charles McCathieNevile, Opera Software: Standards Group
>    hablo español  -  je parle français  -  jeg lærer norsk
> chaals@opera.com  Catch up: Speed Dial  http://opera.com
>
>
>