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[css3-values] syntax identity of <url> (was: [css4-values] Templated URLs)

From: Kang-Hao (Kenny) Lu <kennyluck@csail.mit.edu>
Date: Fri, 06 Apr 2012 10:41:22 +0800
Message-ID: <4F7E57D2.7050303@csail.mit.edu>
To: WWW Style <www-style@w3.org>
CC: fantasai <fantasai.lists@inkedblade.net>
(12/03/21 7:20), fantasai wrote:
> I received a suggestion[1] from Maxime Thirouin [1] for templating URLs
> with the following example. [2]
> Forwarding here for archival / discussion.
> ~fantasai
> [1] https://twitter.com/MoOx/status/173093535275421697
> [2] http://dabblet.com/gist/1753404
> [data-gravatar-uri]::after
> {
>     content: url(attr(data-gravatar-uri)); /* impossible */
> }
> [snip other new proposals]

When it says 'impossible', does this mean browsers currently don't
support it or CSS3 V&U doesn't support it?

This relates to this questionable statement in the spec

  # It corresponds to the URI token in the grammar. [CSS21]

Is this really true? It was suggested that FUNCTION STRING ')' makes a
<url> too[1] and there's even a test case in the CSS 2.1 test suite (see
the link).

But if 'url(' <string> ')' makes a <url>, I would suggest we include
this description (like how image() is defined) so that the above works.
(Or explicitly disallow it.)

== other irrelevant nitpickings in this section ==

I don't know if this section should remind spec editors that <url> was
<uri> in CSS 2.1. I notice that CSS3 Images is, for instance, using the
wrong ones. But in any case, I support changing the type name to be in
line of the function name.

  # Furthermore it replaces the ‘<url>’ type in the
  #‘background-image’ and ‘list-style-image’ definitions in CSS1
  # and CSS2 and adds ‘<image>’ as an alternative to ‘<url>’ in the
  # ‘content’ property's value. It is presumed that CSS
  # specifications beyond CSS2.1 will use the ‘<image>’ notation in
  # place of ‘<url>’ where 2D images are expected.

(This was too nitty so I didn't get to report it.)

  # Note that in some CSS syntactic contexts (as defined by that
  # context), a URL can be represented as a <string> rather than by
  # <URL>. An example of this is the ‘@import’ rule.


  # Parentheses, whitespace characters, single quotes (') and double
  # quotes (") appearing in a URL must be escaped with a backslash so
  # that the resulting value is a valid URL token, e.g.
  #‘url(open\(parens)’, ‘url(close\)parens)’.

s/URL token/URI token/

and also that should link to the CSS 2.1 grammar instead of the

[1] http://lists.w3.org/Archives/Public/www-style/2011Apr/0701

Received on Friday, 6 April 2012 02:41:52 UTC

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