Re: Graphics contrast comments overview

Hi Jon,

> if the author uses a border to communicate the role of something 
> then the aspect has to meet the contrast requirements.

Agree. Also, I noticed we missed out the default-appearance exception, so I’ve updated that to say:
“Visual information used to indicate state for active user interface components, except where the appearance of the component is determined by the user agent and not modified by the author.”

> 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.  

Agree.

> 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. 

Agree.

> 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. 

Agree. It is also worth considering the ‘adjacent’ aspect, if buttons are not immediately adjacent, then they do not have to contrast with each other.

> Focus indicators need to provide 3:1 contrast as well.  Is that right?
   
Yes, although with-what depends on what they are adjacent to.

Cheers,

-Alastair

Received on Wednesday, 15 November 2017 16:25:11 UTC