RE: A test for Color. Please comment.

I’m not talking about the rules – I am talking about the tests.

 

From: Wayne Dick [mailto:wayneedick@gmail.com] 
Sent: Friday, March 31, 2017 2:20 PM
To: James Nurthen <james.nurthen@oracle.com>
Cc: public-low-vision-a11y-tf <public-low-vision-a11y-tf@w3.org>; GLWAI Guidelines WG org <w3c-wai-gl@w3.org>; Wayne E Dick <waynedick@knowbility.org>
Subject: Re: A test for Color. Please comment.

 

Thanks James.

Yes I thought of limiting this to HTML elements that contain text, and I have compiling the list. Then the queries could go

e1, e2, ..., en {rules}

I wanted to get a block concept out before I proceeded.

Wayne

 

 

On Fri, Mar 31, 2017 at 12:17 PM, James Nurthen <james.nurthen@oracle.com <mailto:james.nurthen@oracle.com> > wrote:

You need to change the last 2 to only be testing text. We would not expect images to change color based on this.

(note – I haven’t thought about the rest of it enough to comment either way)

Does the color of text and its background change?

Does some text keep its original color?

 

 

From: Wayne Dick [mailto:wayneedick@gmail.com <mailto:wayneedick@gmail.com> ] 
Sent: Friday, March 31, 2017 12:03 PM
To: public-low-vision-a11y-tf <public-low-vision-a11y-tf@w3.org <mailto:public-low-vision-a11y-tf@w3.org> >; GLWAI Guidelines WG org <w3c-wai-gl@w3.org <mailto:w3c-wai-gl@w3.org> >; Wayne E Dick <waynedick@knowbility.org <mailto:waynedick@knowbility.org> >
Subject: A test for Color. Please comment.

 

This is a start. Note this is not user facing, this is a test for authors and accessibility authors. 


 


This is a test for authors:

1.  Pick a set S1 of 3 random integers between 16 and 48

2.  Pick a set S2 of 3 random integers between 182 and 218

3.  From these sets choose 2 pairs as follows:

4.  Pair 1 = (c, b) where c = (c1, c2, c3) is chosen from the first set S1 and b = (b1, b2, b3) is chosen from the second set S2. (dark on light)

5.  Pair 2 = (c, b) where c = (c1, c2, c3) is chosen from the second set S2 and b = (b1, b2, b3) is chosen from the first set S1. (light on dark)

6.  Insert the following statement as the last element in the head element:

<style>

 body, body * {

color: rgb (c1, c2, c3);

background-color: rgb(b1, b2, b3);

}

*:hover, *:focus, mark {

color: rgb(b1,b2,b3);

background-color: rgb(c1,c2,c3)
<style>

7.  Reverse the roles of (c1, c2, c3) and (b1, b2, b3)

The test for accessibility auditors is the same. It can be done using the same change in code inspectors.

 

Notes: One can start without !important to flesh out embedded style. Do it with !important to see if this is overridden.

 

What to see:

Does any essential content disappear? That is a failure.

Do colors change?

Do some colors keep their original?

 

If original colors persist, remove background images.

 

Does any essential content disappear? That is a failure.

Do colors change?

Do some colors keep their original?

 

If in these steps any answer is no, the SC fails.