Re: [csswg-drafts] [css-ui-4] choosing background colors for accent-color for contrast (#6159)

I made a test page with many checkbox accent-colors and compared the output with firefox nightly, chrome before my new contrast ratio patch, and chrome after my contrast ratio patch:

### Firefox Nightly
![Screen Shot 2021-06-10 at 12 06 47 PM](https://user-images.githubusercontent.com/7681467/121583321-f8461100-c9e4-11eb-947d-23e4ea900eb6.png)
### Chrome before [new contrast patch](https://chromium-review.googlesource.com/c/chromium/src/+/2907972)
![Screen Shot 2021-06-10 at 12 07 20 PM](https://user-images.githubusercontent.com/7681467/121583230-dcdb0600-c9e4-11eb-93e0-2c893571fd1b.png)
### Chrome after [new contrast patch](https://chromium-review.googlesource.com/c/chromium/src/+/2907972)
![Screen Shot 2021-06-10 at 12 07 27 PM](https://user-images.githubusercontent.com/7681467/121583260-e4021400-c9e4-11eb-9e00-65c436223fbb.png)


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Received on Thursday, 10 June 2021 19:12:50 UTC