Use the fontWeight style attribute to define the aspect of a font.
{ black | bold | book | condensed | condensedbold | condensedlight | demibold | extrablack | heavy | light | medium | normal | regular | semibold | thin }
The availability of the weight depends on the chosen font family. For example, if the font family is defined as AmericanTypewriter, and the front-end platform supports the following set of font names (for this font family): AmericanTypewriter, AmericanTypewriter-Light, AmericanTypewriter-Bold, AmericanTypewriter-CondensedLight, AmericanTypewriter-CondensedBold, AmericanTypewriter-Condensed, you can only use the condensed, light and bold font weights.
Before using a font weight, make sure that the target platform supports the value. For example, on "Androidâ„¢ devices, only normal and bold are supported.
<StyleAttribute name="fontWeight" value="bold" />