Re: Graphics contrast comments overview

I think you want to replace the word "graphic" with "non-text content" in 
the exception too.

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 non-text content is essential 
to the information being conveyed.

I assume time-based media would have an out from the 'essential' wording?

I continue to be a bit worried about the 'vagueness' of "adjacent 
color(s)". For controls, I really think we're talking about the colors 
adjacent to the outline of the control? Is something like "colour(s) 
adjacent to the perimetre" any better?

Michael Gower
IBM Accessibility
Research

1803 Douglas Street, Victoria, BC  V8T 5C3
gowerm@ca.ibm.com
voice: (250) 220-1146 * cel: (250) 661-0098 *  fax: (250) 220-8034



From:   Alastair Campbell <acampbell@nomensa.com>
To:     WCAG <w3c-wai-gl@w3.org>
Date:   2017-11-14 10:23 AM
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://urldefense.proofpoint.com/v2/url?u=https-3A__www.w3.org_2002_09_wbs_35422_Graphics-5Fand-5FUI-5FContrast20171109_results&d=DwIFAg&c=jf_iaSHvJObTbx-siA1ZOg&r=_9rqR3xSCWQUlv9VpOcJwkP7H0XWQXmxeMmqQl6Fikc&m=VxgFbjc3FKxALRoT55TfE_4iiAeuQpxBzv8z0oM3MfE&s=yP0v7_auE7b3ifb33DPF-szrRnP9yNsNUTE4AB5aF5s&e= 

2] 
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.cssdesk.com_2g7MM&d=DwIFAg&c=jf_iaSHvJObTbx-siA1ZOg&r=_9rqR3xSCWQUlv9VpOcJwkP7H0XWQXmxeMmqQl6Fikc&m=VxgFbjc3FKxALRoT55TfE_4iiAeuQpxBzv8z0oM3MfE&s=NnD3qz57TzkSP_nC_IO0NI-wV5AcvQwEYESL8ZvsTA0&e=