W3C home > Mailing lists > Public > w3c-wai-ig@w3.org > April to June 2010

RE: high contrast and background images

From: Thierry Koblentz <ng@tjkdesign.com>
Date: Sat, 12 Jun 2010 20:22:34 -0700
To: "'Roger Hudson'" <rhudson@usability.com.au>, <w3c-wai-ig@w3.org>
Message-ID: <042a01cb0aa7$ab7e04d0$027a0e70$@com>
There was an article posted recently about this very issue (high-contrast):



The original technique is explained here (it mentions other
accessibility/usability issues):



The only problem I see with this method is that the sprite does not belong
to the styles sheet but is embedded into the HTML.

If there is no versioning of the image then it's not a problem, but if there
is versioning then it means authors have to edit many documents (unless they
keep the file path as a variable).


Two other advantages of this technique:

1.       it does *not* rely on negative text-indent so when images are not
available the text is visible within the viewport.

2.       When users highlight content (i.e., ctrl + A or cmd + A) images
(*unlike* background images) appears as selected. 





www.tjkdesign.com |  <http://www.ez-css.org> www.ez-css.org |



From: w3c-wai-ig-request@w3.org [mailto:w3c-wai-ig-request@w3.org] On Behalf
Of Roger Hudson
Sent: Saturday, June 12, 2010 7:36 PM
To: w3c-wai-ig@w3.org
Subject: high contrast and background images




I have come across and interesting problem with background images. Some
sites use a background (CSS) image for the main banner at the top and this
sometimes contains navigation items. When you select the High Contrast
option with Windows XP and Windows 7 it appears that background images are
not displayed with Internet Explorer or Firefox, but are displayed with
Opera. Love other opinions about how this stands accessibility-wise.




Roger Hudson

Web Usability

Email:  <mailto:rhudson@usability.com.au> rhudson@usability.com.au

Web:  <http://www.usability.com.au/> www.usability.com.au 

Blog: www.dingoaccess.com   


Received on Sunday, 13 June 2010 03:23:02 UTC

This archive was generated by hypermail 2.4.0 : Friday, 17 January 2020 20:36:35 UTC