RE: Graphics contrast comments overview

> Borders: I think borders need to come under "visual information used to indicate state", where the active state (that it exists) is a state. Otherwise James' example [2]  about a strong border on one side passing vs the same thing with an additional light border on 3 sides is true.

Let we summarize what I think what you are saying is that if the author uses a border to communicate the role of something then the aspect has to meet the contrast requirements.  It doesn't require an author provide that affordance if they didn't.  So if I choose to make a piece of text blue and have it function like a button nothing needs to be done other than the contrast of the blue text in the non-focused state or non-pressed state of that button.  If I use a solid background to make something look like a button then I have to make sure the edge of the background has sufficient contrast from the surrounding pixels outside of the focused or pressed state.  If I have multiple buttons with some in pressed and others in non-pressed states the difference between the colors used for the pressed states need to have a 3:1 ratio as well.   Focus indicators need to provide 3:1 contrast as well.  Is that right?

Jonathan

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-----Original Message-----
From: Alastair Campbell [mailto:acampbell@nomensa.com] 
Sent: Tuesday, November 14, 2017 1:20 PM
To: WCAG <w3c-wai-gl@w3.org>
Subject: Graphics contrast comments overview

Hi everyone,

I did a little comment round-up (as SC manager) so that I could summarise the new draft text, topically in comment order from the survey [1]:

Borders: I think borders need to come under "visual information used to indicate state", where the active state (that it exists) is a state. Otherwise James' example [2]  about a strong border on one side passing vs the same thing with an additional light border on 3 sides is true.

I would also rather not call out one specific method of providing that indicator without calling out all of them. E.g. A button could be indicated by a background rather than border.

Focus indicators: Again, might not be indicated by a border/outline, it could be a change of background or text attribute. I'd rather wrap that up in the understanding doc.

Adjacent colours: I think that was a simple omission by accident, I've added that to my draft.

4.5:1 - I'm happy about adding a 4.5:1 version at AAA (apart from me needing to create docs for that).

Non-text content: We had a comment from Sailesh about whether it covers text in graphics (which it shouldn't), he suggest saying "non-text content" instead of "graphical information", can anyone see a problem with that?

Extend the "except" sentence - agree (although this doesn't apply if we only have one exception, see below).

Sensory exception: Bruce, if you don't think we need it, it's gone. (I argued to keep it because you asked for it!)

Logotypes: Do people agree that would come under 'essential'?

Inactive state (Alex): The text only scopes in "active user interface components", so I don't think we need that exception.

Subjectivity: "It is fundamentally subjective as to whether any given part of the graphics is required to understand graphical content."
I agree it is subjective, but I think we can get to good consistency. Can we agree to test that at implementation?

If people agree with all of the above, that leaves us with:
----------------------
The visual presentation of non-text content has a contrast ratio of at least 3:1 against adjacent color(s) for each of the following

- Controls: Focus indicators, and visual information used to indicate state for active user interface components
- Graphical objects: Parts of graphics required to understand the content

Except when a particular presentation of the graphic is essential to the information being conveyed.
----------------------

The text is getting simpler, is something going wrong??

-Alastair

1] https://www.w3.org/2002/09/wbs/35422/Graphics_and_UI_Contrast20171109/results 
2] http://www.cssdesk.com/2g7MM

Received on Wednesday, 15 November 2017 01:08:56 UTC