The larger and smaller keywords of the font-size property function using the scaling factor of 1.2. : font size : CSS Attributes and Javascript Style Properties HTML CSS TUTORIALS
<p id='larger'> This font is 1.2 times the default font, or 20 pixels.<br /> <span>this is a test. </span> </p> <p id='smaller'> This font is 1.2 smaller than the default size, or pixels.<br /> <span>this is a test. </span> </p> </body> </html>