Styles are automatically applied to source code text. With the exception of comment styles, you cannot explicitly apply a style yourself, like in a word processor. The applicable language parser is used to assign styles based on parsed information.
Styles are used automatically for the following:
Language keywords, for example C keywords such as while, and void.
Delimiters and numbers.
Comments
Declarations of symbols - for example a function declaration.
References to symbols - for example, a call to a function.
User-defined identifier associations - You can explicitly associate a style with any identifier by editing the language’s keyword list.