[csswg-drafts] [css-backgrounds-4] keyword for pill shape (#6524)

jsnkuhn has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-backgrounds-4] keyword for pill shape ==
There's a very specific pill shaped corner that can be made with border-radius that can only be done reliably with `px` in my experience.

![image](https://user-images.githubusercontent.com/1286791/129922589-9819e4a7-060d-4b72-8cb2-30f7067184e9.png)

When trying to get the same shape at different element sizes (or when you don't yet know what the size is going to be) it's common to see this hack:

> border-radius: 99999px;

I'm wondering about the possibility of a value keyword for this shape something like `border-radius: pill;`

https://drafts.csswg.org/css-backgrounds-4/#corner-sizing

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/6524 using your GitHub account


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