code: function parseSLComment(css) {
      var start = pos;
  
      // Read the string until we meet line break.
      // Since we already know first 2 characters (`//`), start reading
      // from `pos + 2`:
      for (pos += 2; pos < css.length; pos++) {
        if (css.charAt(pos) === '\n' || css.charAt(pos) === '\r') {
          break;
        }
      }
  
      // Add comment (including `//` and line break) to the list of tokens:
      pushToken(TokenType.CommentSL, css.substring(start, pos--), col);
      col += pos - start;
    }
docs: Parse a single line comment
  @param {string} css Unparsed part of CSS string