anchor.diff:        li Gherkin
         li Behave
         li Features and steps
  -      li Mocha+      li Mocha
  
positive.code:       li Documents behavior
        li Binds to test cases
  
    section(data-narration="/bdd/8")
      h2 Example: Gherkin
      pre.
        Feature: App store validates customer credit card
  
negative.code:   section(data-narration="/bdd/7")
      h2 But what is a consistent format?
  
    section(data-narration="/bdd/8")
      h2 One Format: Gherkin
      ul
        li Domain specific language
  