anchor.diff:  But we recognize that can be a major obstacle when you're starting out.
   Therefore, your other option is to simply redeclare the fonts from the https://github.com/asciidoctor/asciidoctor-pdf/blob/master/data/themes/default-theme.yml[default theme] in the <<Custom Fonts,font catalog>>.
   Asciidoctor PDF will then resolve the fonts that are bundled with the gem.
  -If you don't declare your own fonts, the <<Built-In (AFM) Fonts,built-in AFM fonts>> will be used instead.
  -However, since AFM fonts only support WINANSI characters (which is similar to Basic Latin), using them will likely result in missing functionality and warnings.
  +
  +WARNING: If you don't declare your own fonts, the built-In (AFM) Fonts declared in https://github.com/asciidoctor/asciidoctor-pdf/blob/master/data/themes/base-theme.yml[base theme] will be used instead.
  +However, since AFM fonts only support WINANSI characters (which is similar to Basic Latin), using them will result in missing functionality and warnings. See <<built-in-afm-fonts,Built-In (AFM) Fonts>> section to know more about limitations.
   
   toc::[]
   
  
positive.code: Even though the built-in fonts require the content to be encoded in WINANSI, _you still type your AsciiDoc document in UTF-8_.
  Asciidoctor PDF encodes the content into WINANSI when building the PDF.
  
  .WINANSI Encoding Behavior
  ****
  When using the built-in PDF (AFM) fonts on a block of content in your AsciiDoc document, any character that cannot be encoded to WINANSI is replaced with a logic "`not`" glyph (`&#172;`) and you'll see the following warning in your console:
  
negative.code: 
  This behavior differs from the default behavior in Prawn, which simply crashes.
  
  To prevent this warning, you need to provide a TrueType font when using caracters outside the WINANSI set (callout numbers for example).
  
  For more information about how Prawn handles character encodings for built-in fonts, see https://github.com/prawnpdf/prawn/blob/master/CHANGELOG.md#vastly-improved-handling-of-encodings-for-pdf-built-in-afm-fonts[this note in the Prawn CHANGELOG].
  ****
  
  
  === Bundled Fonts
  
  