- From: Ian Jacobs <ij@w3.org>
- Date: Thu, 11 Jan 2001 19:44:38 -0500
- To: pdf@bizfon.com
- CC: www-validator@w3.org
pdf@bizfon.com wrote: > > In the "XHTML 1.0: The Extensible HyperText Markup Language" document, located > here: > http://www.w3.org/TR/2000/REC-xhtml1-20000126/ > > Appendix C (C.13) states: > CSS style sheets for XHTML should use lower case element and attribute names. > > So then if my page contains this: > <style type="text/css"> > BODY {} > #TOPTITLE {} > </style> > > is that no good? I'm not sure what the document > means by "element and attribute > names" in a CSS document. I can understand the > element requirement to be lower > case (since html elements must be written in lowercase), > but I don't know when > you would possibly specify an attribute name in a CSS > document. For the record, > my document validates with the above style. > Should this validate? Here's my take: 1) "All CSS style sheets are case-insensitive, except for parts that are not under the control of CSS. For example, the case-sensitivity of values of the HTML attributes "id" and "class", of font names, and of URIs lies outside the scope of this specification. Note in particular that element names are case-insensitive in HTML, but case-sensitive in XML. " -- CSS2, section 4.1.3 http://www.w3.org/TR/1998/REC-CSS2-19980512/syndata.html#q4 This suggests to me that: * CSS doesn't care whether you write "body" or "BODY" because that's "outside" CSS. * When CSS is used in the context of XHTML, then case does matter, so you shouldn't use "BODY", because that doesn't match "body". * Strictly speaking, it's not the validator's job to detect that you have used BODY and should have used body. All the validator cares about is that you've put CDATA in the style element. * Perhaps an extra feature of the validator would be to validate that element and attribute selectors in xhtml documents were lower case. But that would require special case programming (though I don't know since I didn't write the validator). 2) "CSS2 allows authors to specify rules that match attributes defined in the source document." -- CSS2, section 5.8 http://www.w3.org/TR/1998/REC-CSS2-19980512/selector.html#attribute-selectors - Ian -- Ian Jacobs (jacobs@w3.org) http://www.w3.org/People/Jacobs Tel: +1 831 457-2842 Cell: +1 917 450-8783
Received on Thursday, 11 January 2001 19:44:40 UTC