::first-line	
/*Selects the first line of content in an element. Typically applied to paragraphs (for example p::first-line). Useful for first-line run-in effects.*/

::first-letter	
/*Selects the first letter of an element. Typically applied to paragraphs or headings (for example, p::first-letter). Useful for creating initial and drop caps.*/

::before	
/*Inserts content before a selection. Has all sorts of uses: generating opening quote marks for pull quotes, creating separators for navigation bar links, and much more.*/

::after	
/*Just like ::before, with all the same uses, but generates content after a selection.*/

::selection	
/*Changes the appearance of selected text.*/