BUG: css validator transforms case

Hi,

At least with input from [1] the CSS Validator transforms lower-/mixed-
case element selectors to upper-case. Example

  björn { width: 10em }

becomes

  BJÖRN {
     width : 10em; 
  }

as a result, the selector won't match any longer in case-sensitive
documents.

[1]  http://jigsaw.w3.org/css-validator/validator-text.html
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