What is the difference between the standard Pascal and...

Modern Pascal provides more securities and fewer ambiguities during programming and coding. Whereas Standard Pascal provides more ambiguities, errors and fewer securities while coding or programming.
Modern Pascal offers the removal of the limit of any string length if the size is defined. Whereas, standard Pascal doesn’t allow the removal of limit of length.
Modern Pascal makes advancement over the standard Pascal by providing the var parameters that are used in functions and procedures.
Modern Pascal provides backward compatibility with the use of parameters in functions and procedures. But standard Pascal doesn’t provide backward compatibility.
Modern Pascal provides definitive compatibility with the use of symbols, whereas Standard Pascal doesn’t provide any compatibility related to symbols.

What is the difference between the standard Pascal and Modern Pascal?