Assertion:
This is one of those occasions where you just have to scratch your head - an element whose explicit purpose is to center content can be used to left and right align content as well with the ALIGN attribute.

Content centered using the CENTER element, no ALIGN attribute:
CENTERed text CENTERed text CENTERed text CENTERed text

Content centered using the CENTER element, ALIGN=left attribute:
CENTERed text CENTERed text CENTERed text CENTERed text

Content centered using the CENTER element, ALIGN=right attribute:
CENTERed text CENTERed text CENTERed text CENTERed text

Content centered using the CENTER element, ALIGN=center attribute:
CENTERed text CENTERed text CENTERed text CENTERed text