Hi Eric,
The last note in the contrast ratio definition covers that:
https://www.w3.org/WAI/WCAG21/Understanding/non-text-contrast.html#key-terms
(Applies to text & non-text contrast.)
So no, it doesn’t fail the requirement.
For text content you can generally over-ride it to your scheme and it is readable, but for many graphics that wouldn’t be the case. It is hard enough to get 5 slices of a pie chart contrasting against a white background, it would be impossible to do the same for a dark background.
If there were a programmatic way of defining foreground colours in graphics (e.g. SVG) so you could inverse the colours I could see that being covered in future, but there would be a lot of implementation work to do that.
Cheers,
-Alastair
From: Erich Manser
LVTF,
If an application can pass min contrast for icons on white background, but the icons cannot meet the min ratio when switched to black background (Win High Contrast black), is this a failure of the requirement?
Thank you for any information!
[cid:1__=0ABB0E93DFD959148f9e8a93df938690918c0AB@]<http://www.ibm.com/able>
Erich Manser
IBM Accessibility Design
Littleton, MA / tel: 978-696-1810
[cid:3__=0ABB0E93DFD959148f9e8a93df938690918c0AB@]
You don't need eyesight to have vision.
