[csswg-drafts] Attribute Selectors with CURIEs (#13702)

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

== Attribute Selectors with CURIEs ==
With respect to [CURIE and safe-CURIE](https://www.w3.org/TR/curie/) attribute values:

```html
<html version="XHTML2"
      xmlns="http://www.w3.org/1999/xhtml"
      xmlns:MR="http://www.example.org/roles/myRoles#">
      <head profile="http://www.w3.org/1999/xhtml/vocab">
          <title>An XHTML 2 document using Role</title>
      </head>
      <body>
          <p role="MR:main">The main content</p>
          <p role="MR:music">Some musical support for the page</p>
      </body>
</html>
```

```html
<html version="XHTML2"
      xmlns="http://www.w3.org/1999/xhtml"
      xmlns:MR="http://www.example.org/roles/myRoles#">
      <head profile="http://www.w3.org/1999/xhtml/vocab">
          <title>An XHTML 2 document using Role</title>
      </head>
      <body>
          <p role="[MR:main]">The main content</p>
          <p role="[MR:music]">Some musical support for the page</p>
      </body>
</html>
```

In the event of interest in being able to select such attributes by their values for styling purposes, here is a proposed solution:

```css
p[role=url('http://www.example.org/roles/myRoles#main') curie] { ... }
```
and perhaps:
```css
@namespace mr url('http://www.example.org/roles/myRoles#');

p[role=url(mr|main) curie] { ... }
```

This approach would also work with attributes' values consisting of space-delimited lists of CURIEs and safe-CURIES:

```css
p[role~=url('http://www.example.org/roles/myRoles#main') curie] { ... }
```
and perhaps:
```css
@namespace mr url('http://www.example.org/roles/myRoles#');

p[role=~url(mr|main) curie] { ... }
```

Thank you. What do you think of this proposed approach? Are there any other syntax options to consider for these scenarios?

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/13702 using your GitHub account


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Received on Monday, 23 March 2026 15:44:35 UTC