What are the difference between:
@media (max-width: width) { /* CSS Rules */ }
@media screen (max-width: width) { /* CSS Rules */ }
@media screen and (max-width: width) { /* CSS Rules */ }
@media only screen and (max-width: width) { /* CSS Rules */ }
@media only screen (max-width: width) { /* CSS Rules */ }
Also, is it required to add the 'and' keyword?