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/usr/share/highlight/langDefs/css.lang is in highlight-common 3.41-1.

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The actual contents of the file can be viewed below.

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Description="CSS"

Identifiers=[[ [a-zA-Z_][\w\-]* ]]

Digits=[=[ \#[[:xdigit:]]{3,6}|\d*\.?\d+?\w* ]=]

Keywords={
  { Id=1,
    Regex=[[ ([\w-]+)\s*\: ]]
  },
  { Id=2,
    Regex=[[^@[\w-]+]],
  },
  { Id=3,
    Regex=[[^\s*(\..+?)\s*\{]],
  },
  { Id=4,
    Regex=[[ ^\s*(#[\w-]+) ]]
  },
  { Id=4,
    Regex=[[ url\(([\w\.\/]+)\) ]]
  },
}

Strings={
  Delimiter=[["|']],
  Escape= [=[ \\[[:xdigit:]]{4} ]=],
}

Comments={
  { Block=true,
    Nested=true,
    Delimiter= { [[\/\*]],[[\*\/]],}
  }
}


IgnoreCase=true

Operators=[[\(|\)|\[|\]|\{|\}|\,|\;|\:|\&|<|>|\!|\=|\/|\*|\%|\+|\-|\.|~]]