[csswg-drafts] [css-values] Get the URL of the current document (#6546)

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

== [css-values] Get the URL of the current document ==
One of the use cases for #6544 is to provide a QR code that, when scanned, would be the URL of the current document. But apparently there's no way to get the URL of the current document from CSS.

```
[18:33] <hober> Ooooh, very simple CSS question that I apparently don't         
                know the answer to: How can I, from CSS, get a URL to           
                the current document? Not the current stylesheet, the           
                current document. What to pass to url()?                        
[18:36] <cbiesinger> I didn't think that was possible                           
```

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/6546 using your GitHub account


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