Default code block vs code syntax highlighter

Code block macro

YAML: YAML Ain't Markup Language

What It Is: YAML is a human friendly data serialization
  standard for all programming languages.

YAML Resources:
  YAML 1.2 (3rd Edition): http://yaml.org/spec/1.2/spec.html

Projects:
  C/C++ Libraries:
  - libfyaml           # "C" YAML 1.2 processor
  
  Python:
  - PyYAML             # YAML 1.1, pure python and libyaml binding
  - ruamel.yaml        # YAML 1.2, update of PyYAML with round-tripping of comments
  - PySyck             # YAML 1.0, syck binding

Code Syntax Highlighter