RE: F24 - contrast

The history of this is to enable users to *switch* colours (black to white
and vice versa) without the hard coded colours preventing then change... so
it black switches to white in the background but the foreground doesn’t
switch then you have black text on black background... this is one of those
success criteria that we will want to look closely at, because as far as I
can tell AT that switches colours such as zoomtext will override even hard
coded colours and successfully make the change, We would have to check
Windows high contrast mode, but I think it does the same thing... so I
question whether we should continue to fail it...

 

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From: Adam Solomon [mailto:adam.solomon2@gmail.com] 
Sent: December 11, 2013 9:13 AM
To: WCAG
Subject: F24 - contrast

 

is F24 - http://www.w3.org/TR/2013/NOTE-WCAG20-TECHS-20130905/F24

a failure even if the actual contrast meets the minimum contrast requirement
ratio? In other words, if an author were to specify black text color in css
(and left the default background-color of say white) where the ratio meets
the success criterion de facto, would this still fail since no bgcolor was
specified in the css (because the user could run into problems if he did
choose a different default background color in his browser settings)?

Thank you in advance for any feedback