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Contrast ratio 4.5:1 applies to rollovers?

From: Samantha Bird <sbird@nmqa.com>
Date: Mon, 22 Oct 2012 15:55:29 +0100
Message-ID: <CABm2K39P27jxFN1+HdYe326rnpZnWcSdNzXY0v3c=ddOhRtMvw@mail.gmail.com>
To: w3c-wai-ig@w3.org
Hi All,

I just wanted to check the rules for contrast ratios when it comes to
rollovers. As far as I know in order to meet level AA, the contrast ratio
must meet 4.5:1 except in the following circumstances:

   - *Large Text: *Large-scale
<http://www.w3.org/TR/WCAG/#larger-scaledef> text
   and images of large-scale text have a contrast ratio of at least 3:1;
   - *Incidental: *Text or images of text that are part of an inactive user
   interface component<http://www.w3.org/TR/WCAG/#user-interface-componentdef>,
   that are pure decoration <http://www.w3.org/TR/WCAG/#puredecdef>, that
   are not visible to anyone, or that are part of a picture that contains
   significant other visual content, have no contrast requirement.
   - *Logotypes: *Text that is part of a logo or brand name has no minimum
   contrast requirement.

I am not sure if rollover states would come under the 'incidental' rule or
whether the contrast ratio does not need to be taken into account for
rollover states as the rollover just emphasises a change in state. Any
guidance here would be much appreciated.

Thanks all.


Kind Regards,*

Samantha Bird
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Received on Monday, 22 October 2012 14:55:57 UTC

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