The PRE element is often used to include blocks of plain text. For example you can use it to include examples of typed code, such as the following extract from a C program:
/* main program for fitting program */ extern int *sharv; static char boggle[100]; main (int argc, char *argv) double x_transpose, y_transpose, f_ack=2.3; { ....
PRE is also useful for simple tables, as in:
Item Price Tax Total Category fileserver 10000 300 10300 A disk drive 900 30 930 B transmission 4400 110 4510 C fertilizer 5500 100 5600 FThe markup tags take up no space: if you delete everything alt the tags inside the PRE, you will see that all the columns line up.