Use logical formatting tags wherever possible, since most browsers support them.
The result may be different depending on which browser is used to view your document.
Logical character formatting tags;
This is a citation, using the <CITE> tag
This is a piece of code, using the <CODE> tag
This is to be entered on a keyboard, using the <KBD> tag
This is emphasized, using the <EM> tag
This is strong, using the <STRONG> tag
Physical character formatting tags;
This is italics, using the <I> tag
This is underlined, using the <U> tag
This is boldface, using the <B> tag
This text is centered, using the <CENTER> tag