These elements do NOT cause page breaks, and simply change the rendering of the characters enclosed inside the tags. Also, some browsers do not support all physical styles. You should be cautious in their user. Examples are given below, which will let you test the abilities of your own browser.
FONT is discussed in more detail below.
ABBR An abbreviation. Q A short inline quotation. A sequence of literal characters. VAR A variable name. These elements physically determine the desired renderings.