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if a line in the css source begins with a backslash, the section with the output of the Valid CSS information omits it, thus making the code shown (often) invalid.
I would need more information there. \foo { color: red; } will be seen as unicode \f followed by oo, while \oof will be recognized as 'oof' See http://www.w3.org/TR/CSS21/grammar.html
Fixed by changing the convertIdent to canonicalize instead of creating unicode characters. Here is an example that now works: \foo { color: green; } now gives \00000foo { color: green; } (a valid output).