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Re: [csswg-drafts] [css-color-5] Add `currentBackgroundColor` Variable (#5292)

From: Kevin Lozandier via GitHub <sysbot+gh@w3.org>
Date: Wed, 11 Nov 2020 17:56:05 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-725570342-1605117363-sysbot+gh@w3.org>
I have an example. Suppose I wanted to create the following as a Web component (or built w/ whatever component
<img width="326" alt="Screen Shot 2020-11-11 at 9 45 04 AM" src="https://user-images.githubusercontent.com/1223224/98845536-b7f8c300-2402-11eb-841d-7fb730cd988b.png">

It'd be great to set the background as a gradient using `currentBackgroundColor` & `--some-variable` with something like
:host {
  contain: content;
  box-sizing: border-box;
  border: 1px solid black;
  background: linear-gradient(to bottom currentBackgroundColor, --some-variable);
`currentBackgroundColor` would be useful to make sure the absolutely positioned image at the top of the component elegantly visually "breaks" the border.

I think for that reason it should exist in some form. I really like @LeaVerou's idea of a `current()` though when I think about it, it seems intuitive `currentBackgroundColor` exists as an out-of-the-box variable alongside `currentColor`. 


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