Q:

Why doesn't Stack Overflow highlight the “get” and “set” keywords? ( C#)

Ok, сontinuing the theme of highlighting.  Why doesn't Stack Overflow highlight the "get" and "set" keywords?  Even with <!--  language: lang-c# -->:
public class Something
{
    private readonly int field;
    public int Property { get; protected set; }
}

EDIT: there is also an issue with "readonly". 

A:

As Tim noted in comments, this is something you'll need to take up with the Prettify folks to get this implemented (if it is even possible and desirable).