Attached is a screenshot of my home machine, which uses a custom frame color. The contrast ratio of the background tab text (#d2d9d2) to the frame (#647c64) is 3.16, which is well below minimum accessibility specs, and low enough that I have to focus on tab titles to read them instead of being able to do it at a glance. In my first couple days of usage of refresh, this is probably the most troublesome aspect. I suspect bettes@ was trying to make background tabs fade into the frame a bit more, but the net effect here is decreasing usability.
pbos@ and bsep@ both shared similar sentiments that the contrast was too low for other screenshots posted in the chat channel. pbos@ volunteered to take this on.
I think we need to change background tabs/the NTB to either do what the caption buttons do (always use white/GG900), or else compute the contrast ratio of how we're blending, and limit the blend amount to maintain a 4.5 contrast ratio.
Note that in this case, using white text would produce a ratio of 4.55.
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contrast.png
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Comment 1 by bugdroid1@chromium.org
, Jun 21 2018