Issue 10 UI Interface contrast

I've begun to spend some attention on this to try to help. Rather than

​      ​
"visual presentation of all essential graphical objects for user interface
components"

How about

​     ​
"
​essential ​
visual identifiers of user interface components"


SC Text proposal
      All essential visual identifiers of user interface components have a
contrast ratio of at least 3:1, except when the component is inactive.

Definition for glassary

     Visual identifiers of User Interface Components: A visual indication
that the component is interactive.  This may be a border, icon, or other
visual indication (which doesn't rely on color alone). Focus and selection
indicators represent separate states of the interface component which also
require these contrast minimums.


NOTE:
If we want the 2 tier contrast 4.5:1 and 3:1 we could still use the same
language for the first sentence.

    All essential visual identifiers of user interface components have a
contrast ratio of at least 4.5:1, except for the following situations:
​ ...​


Cheers,
David MacDonald



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