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RE: 1.4.1 clarification

From: Gavin Thomas <Gavin.Thomas@uwe.ac.uk>
Date: Tue, 6 Sep 2011 12:02:16 +0100
To: Benjamin Hawkes-Lewis <bhawkeslewis@googlemail.com>
CC: Gregg Vanderheiden <gv@trace.wisc.edu>, IG - WAI Interest Group List list <w3c-wai-ig@w3.org>, GLWAI Guidelines WG org <w3c-wai-gl@w3.org>
Message-ID: <A169BAD2C2DC6D418270CDC03DF5CDF43996B24240@EGEN-MBX02.campus.ads.uwe.ac.uk>

Yes, that clears it up. 

I assumed even if you had a contrast ratio of 3.1 you were still relying on colour alone to distinguish a link

(I read it as colour contrast ratio)

Thanks for everyone's contributions.

-----Original Message-----
From: Benjamin Hawkes-Lewis [mailto:bhawkeslewis@googlemail.com] 
Sent: 06 September 2011 11:04
To: Gavin Thomas
Cc: Gregg Vanderheiden; IG - WAI Interest Group List list; GLWAI Guidelines WG org
Subject: Re: 1.4.1 clarification

On Tue, Sep 6, 2011 at 10:36 AM, Gavin Thomas <Gavin.Thomas@uwe.ac.uk> wrote:
> Say I have a link that is only visually evident from colour alone (has 
> contrast ratio of at least 3:1) but that changes colour and shows an 
> underline on focus this would meet
>         G183: Using a contrast ratio of 3:1 with surrounding text and 
> providing additional visual cues on focus for links or controls where 
> color alone is used to identify them
> F73 states:
> Note 1: If the non-color cue only happens when the mouse hovers over 
> the link or when the link receives focus, it is still a failure.
> So this is clearly a failure (and a contradiction of g183)

I think you're misunderstanding something here.

F73 fails content where you cannot visually distinguish links from non-links.

G183 is a technique where you visually distinguish links by using a sufficient contrast ratio that the user does not need good color vision.

F73 Note 1 is saying that if you can only visually distinguish links from non-links on hover/focus, it's still a failure. But if you follow G183, then you have visually distinguished links even when not hovered/focused, so you wouldn't fail.

G183 should be read as saying that even when links are unfocused, you must use a contrast ratio of 3.1, *and* when they are focused, you must also use additional visual cues. That's as opposed to reading it as not imposing a requirement on unfocused links.

Does that make sense?

Benjamin Hawkes-Lewis

Received on Tuesday, 6 September 2011 11:03:02 UTC

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