anchor.diff:  * 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._
  +_Asciidoctor PDF cannot italicize a font dynamically like a browser can, so you need the italic style._
   
   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.
  
positive.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 override some of keys described in the sections below, in particular fonts.
  If you don't define your own fonts, the built-in PDF fonts will be used.
  
  toc::[]
  
  
negative.code: http://mplus-fonts.osdn.jp/mplus-outline-fonts/design/index-en.html#mplus_1p[M+ 1p Fallback]::
  A sans-serif font that provides a very complete set of Unicode glyphs.
  Cannot be styled as italic, bold or bold_italic.
  Used as the fallback font.
  
  CAUTION: At the time of this writing, you cannot use the bundled fonts if you change the value of the `pdf-fontsdir` attribute (and thus define your own custom fonts).
  This limitation may be lifted in the future.
  
  === Custom Fonts
  