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Fwd: [CSS21] Unquoted url() syntax

From: Shawn Ligocki <sligocki@google.com>
Date: Tue, 18 Dec 2012 16:33:38 -0500
Message-ID: <CACNG_455eS0Ar9NKy5qRruLA5fcZdbpOH+rRyTfypZigy2hfBg@mail.gmail.com>
To: www-style <www-style@w3.org>
Tokenization for unquoted url()s doesn't makes sense to me (from


Specifically, [!#$%&*-\[\]-~] confuses me. Is it meant to
be [^!#$%&*-\[\]-~]  (that is, all chars except !#$%&*-[]~ )? (Also note
that '-' is listed twice, is that significant or a typo?)

For some context, I am trying to to automatically generate CSS files and I
want to know which chars need to be escaped in unquoted url()s.
Specifically, are unescaped strings allowed? Both Chrome and Firefox do not
appear to allow spaces in unquoted url()s, but I can't tell what part of
the spec is precluding this.

Perhaps they are implementing CSS3 (from

urlchar ::= [#x9#x21#x23-#x26#x27-#x7E] | nonascii | escape

where space #x20 is not allowed? This spec is also confusing,
does #x23-#x26#x27-#x7E mean the same thing as #x23-#x7E? That is all chars
from '!' to '~' inclusive? Or is it a typo and #27 '\'' was meant to be

Received on Tuesday, 18 December 2012 21:34:26 UTC

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