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Re: Focus visible (enh) update

From: Alastair Campbell <acampbell@nomensa.com>
Date: Fri, 18 Oct 2019 11:55:00 +0000
To: Detlev Fischer <detlev.fischer@testkreis.de>, "w3c-wai-gl@w3.org" <w3c-wai-gl@w3.org>
Message-ID: <738A9422-3970-4C30-BB86-892471B8B060@nomensa.com>
> (Having said that, I pointed out in my recent example http://3needs.org/en/testing/code/focus-visibility.html that even a 2px edge can be hard to see, so contrast requirements might need to be tightened.
I discussed this briefly with Andy Somers, and there is an issue there with dark colours and the algorithm used, unfortunately a higher contrast requirement is unlikely to solve that in practice. His recommendation was for surface area being more than 1px thick, rather than increasing contrast.

So I’ll withdraw that potential ‘perimeter’ based suggestion. If we wanted to increase the requirement, it would probably be a case of asking for more than 1px thick indicators, in which case we could drop the contrast/thickness bullet.

However, I think the current SC text is in a good place for a wider public review.

-Alastair



Am 18.10.2019 um 13:15 schrieb Alastair Campbell:
> That would mean that a 2px underline (just one of the longer edges) would not pass?

Correct, for the ‘outer perimeter’ option it would have to be thicker or go around the whole component.

Possible another reason not to go that far?

-Alastair



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