anchor.diff:      +row
           +cell #[code options]
           +cell dict
  -        +cell #[+a("#options") Visualiser-specific options], e.g. colors.
  +        +cell #[+a("#options") Visualizer-specific options], e.g. colors.
           +cell #[code {}]
   
       +footrow
  
positive.code:     +row
          +cell #[code docs]
          +cell list or #[code Doc]
          +cell Document(s) to visualise.
          +cell
  
      +row
          +cell #[code style]
          +cell unicode
          +cell Visualisation style, #[code 'dep'] or #[code 'ent'].
          +cell #[code 'dep']
  
      +row
  
negative.code:         +cell Distance between words in px.
          +cell #[code 175] / #[code 85] (compact)
  
  +h(3, "options-ent") Named Entity Visualizer options
  
  +aside-code("Example").
      options = {'ents': ['person', 'org', 'product'],
  