Understanding of SC 1.4.11

1.       Seeking clarity on contrast of bounds/state

In reading through the understanding doc on SC 1.4.11 non-text contrast I wanted to make sure I understand the following statement regarding the contrast "visual boundaries of the component must have sufficient contrast with the adjacent background" and also regarding the state " adjacent background of the component."

In one case we talk about the boundaries with the adjacent background and the other the adjacent background of the component.  When we measure contrast what is the contrast requirement? for both sides of the border or only for one side?  Does it matter if it's the inside or the outside?


2.       Seeking clarity on reference to SC 1.4.1 Use of Color in understanding 1.4.11.

I agree with what is written under the note SC 1.4.1.  But the references seem a little out of place and I think it might be worth discussing to make sure we are all on the same page.  The way I read the reference is that states used for adjacent controls such as to indicate that one toggle button is pressed and another is not cannot rely on difference lightness unless the lightness is >= 3:1.  The exception is if the state is also communicated with some other visual mechanism then the contrast between states can use any ratio of lightness.       I've always read 1.4.1/1.4.3 this way but wanted to understand the reference to 1.4.1 to understand were one should be flagging this issue.   Should it be flagged under 1.4.1 Color or 1.4.11 non-text contrast if no other mechanism is available other than contrast < 3:1 to show state?

Jonathan