anchor.diff:  === Font Styles
   
   In most cases, whereever you can specify a custom font family, you can also specify a font style.
  -These two settings are combined to locate which font to select.
  +These two settings are combined to locate the font to use.
   
   The following font styles are recognized:
   
  
positive.code: * bold_italic
  
  You'll need all four styles to support AsciiDoc content properly.
  _Asciidoctor PDF cannot italicize a font that is not italic like a browser can._
  
  Once you've obtained the TTF files, put them into a directory in your project where you want to store the fonts.
  It's recommended that you name them consistently so it's easier to type the names in the theme file.
  
negative.code: The theming system in Asciidoctor PDF is used to control the layout and styling of the PDF file Asciidoctor PDF generates from AsciiDoc.
  This document describes how the theming system works, how to define a custom theme in YAML and how to activate the theme when running Asciidoctor PDF.
  
  IMPORTANT: If you're using a custom theme, you're expected to bring your own fonts or declare the fonts from the default theme.
  If you don't declare your own fonts, the built-in PDF (afm) fonts will be used, which only support WINANSI characters (similar to Basic Latin).
  
  toc::[]
  
  