Represents a location in a file or other source of data parsed by the CSS engine.
The bytes and line_bytes offsets are meant to be used to programmatically match data. The lines
and line_chars offsets can be used for printing the location in a file.
Note that the lines parameter starts from 0 and is increased whenever a CSS line break is encountered. (CSS defines the C
character sequences "\r\n", "\r", "\n" and "\f" as newlines.) If your document uses different rules for line breaking, you might want run
into problems here.