W3C home > Mailing lists > Public > wai-xtech@w3.org > May 2007

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

From: Gregg Vanderheiden <gv@trace.wisc.edu>
Date: Wed, 23 May 2007 11:01:02 -0500
To: "'Schnabel, Stefan'" <stefan.schnabel@sap.com>, "'Cooperman, Michael J'" <michael.j.cooperman@sap.com>, "'Aaron M Leventhal'" <aleventh@us.ibm.com>
Cc: <wai-xtech@w3.org>
Message-ID: <008f01c79d53$90af1c30$4b9814ac@NC84301>
Some answers (If I understand your questions properly) 

 

a) yes – content that can be zoomed by brower would meet Level AA.  This is
a no brainer for HTML but if other technologies are used their user agents
must support zoom in a way that works for this to meet Level AA.     (there
are also a number of Advisory techniques here that go beyond Level AA but
you can find here)

 

b)  The ‘em” units recommendations apply to Level AAA  (which requires
reflow)  but would be advisory (not required) at Level AA. 

 

c) Horizontal scrolling is a problem but is allowed at Level AA  (and of
course Level A since there is no requirement there).   Horizontal scrolling
is not allowed for Level AAA conformance. 

 

(Horizontal scrolling  is allowed at Level AA mostly because it isn't
possible to do reflowing with some types of content. )

 

 

 

 

 

Some notes for background:

Although resizing is primarily a user agent function, we have added new
success criteria to address the author's responsibility for supporting text
resizing: 

SC 1.4.4 (Level AA): Visually rendered text can be resized without assistive
technology up to 200 percent and down to 50 percent without loss of content
or functionality. 

SC 1.4.7 (Level AAA): Visually rendered text can be resized without
assistive technology up to 200 percent and down to 50 percent without loss
of content or functionality and in a way that does not require the user to
scroll horizontally.

 


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

 

 


  _____  


From: wai-xtech-request@w3.org [mailto:wai-xtech-request@w3.org] On Behalf
Of Schnabel, Stefan
Sent: Wednesday, May 23, 2007 10:28 AM
To: Gregg Vanderheiden; Cooperman, Michael J; Aaron M Leventhal
Cc: wai-xtech@w3.org
Subject: RE:]RE: Relative Units for Font Size Scaling W3C requirement
replaced by zoom techniques in new Browsers?

Hi Gregg,

 

yea, many thanks for quick reply. .. thats part of the info I need. 

 

Advantage for Zoom is that it does enlarge images proportionally also. Our
designs need that. It needs to be tested if reflowing of text will become an
issue.

 

Questions now: 

 

a) is Greggs Level AA rating when using zoom correct? Is that sufficient
success criteria for W3C regarding font scaling?

b) will the sections that reccommend to use em units be modified to reflect
new zooming techniques in browsers?

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? 

 

Regards,

Stefan

 


  _____  


From: Gregg Vanderheiden [mailto:gv@trace.wisc.edu] 
Sent: Wednesday, May 23, 2007 4:45 PM
To: Schnabel, Stefan; 'Michael Cooper'; 'Aaron M Leventhal'
Cc: wai-xtech@w3.org
Subject: [LIKELY JUNK]RE: Relative Units for Font Size Scaling W3C
requirement replaced by zoom techniques in new Browsers?

Hi Aaron, 

 

      Browsers that have ZOOM on them make the Level AA provisions easy to
conform to.  

 The Level AAA provisions require reflowing the text so that horizontal
scrolling isn't necessary so Zoom won't help you there.   The “enlarge text
font” in browsers would allow users to increase font size but the content
needs to be written properly for this to work.   

 

Does that help? 

 


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

 

 


  _____  


From: wai-xtech-request@w3.org [mailto:wai-xtech-request@w3.org] On Behalf
Of Schnabel, Stefan
Sent: Wednesday, May 23, 2007 7:59 AM
To: Michael Cooper; Aaron M Leventhal
Cc: wai-xtech@w3.org
Subject: Relative Units for Font Size Scaling W3C requirement replaced by
zoom techniques in new Browsers?

Michael, 

I would like to know if the presence of new step-less zooming abilities
(e.g. PageZoom in IE7) will make some of the W3C requirements for font
scaling (like using relative instead of absolute units on web pages) become
obsolete.

If not, if any complaints, please explain or point me to some location where
I can find arguments against built-in zooming techniques in browsers.

We need your input here to give our html-based technologies a definitive
answer if they must use relative units or if they can rely on IE7 for font
scaling.

Aaron, 

I would like to know if something comparable to PageZoom in IE7 is planned
for FireFox 3. 

 

Best Regards, 
Stefan 

Dr. Stefan Schnabel 
Accessibility Expert 
SAP User Experience Accessibility 

SAP AG
Dietmar-Hopp-Allee 16, 69190 Walldorf, Germany
T: +49 (6227) 7-65652
F: +49 (6227) 78-29877

 <mailto:stefan.schnabel@sap.com> mailto:stefan.schnabel@sap.com 
 <file:///\\www.sap.com> www.sap.com 
Sitz der Gesellschaft/Registered Office: Walldorf, Germany
Vorstand/SAP Executive Board: Henning Kagermann (Sprecher/CEO), Shai Agassi,
Léo Apotheker, Werner Brandt, Claus Heinrich, Gerhard Oswald, Peter Zencke
Vorsitzender des Aufsichtsrats/Chairperson of the SAP Supervisory Board:
Hasso Plattner
Registergericht/Commercial Register Mannheim No HRB 350269

Diese E-Mail kann Betriebs- oder Geschäftsgeheimnisse oder sonstige
vertrauliche Informationen enthalten. Sollten Sie diese E-Mail irrtümlich
erhalten haben, ist Ihnen eine Kenntnisnahme des Inhalts, eine
Vervielfältigung oder Weitergabe der E-Mail ausdrücklich untersagt.
Bitte benachrichtigen Sie uns und vernichten Sie die empfangene E-Mail.
Vielen Dank.

This e-mail may contain trade secrets or privileged, undisclosed, or
otherwise confidential information. If you have received this e-mail in
error, you are hereby notified that any review, copying, or distribution of
it is strictly prohibited. Please inform us immediately and destroy the
original transmittal. Thank you for your cooperation. 

 
Received on Wednesday, 23 May 2007 16:01:08 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Friday, 27 April 2012 13:15:42 GMT