anchor.diff:  mixin wikipedia(url)
  +	block
   	sup
   		a(href=url) [W]
   doctype html
  
positive.code: 		script(src='index.js')
  	body
  		table.statistics-confusion
  			caption Confusion matrix#[+wikipedia('https://en.wikipedia.org/wiki/Confusion_matrix')]
  			tr
  				th
  				th Condition positive
  
negative.code: 			tr
  				th Test outcome positive
  				td True positive
  				td: +wikipedia('https://en.wikipedia.org/wiki/False_positives_and_false_negatives#False_positive_error') False positive
  			tr
  				th Test outcome negative
  				td: +wikipedia('https://en.wikipedia.org/wiki/False_positives_and_false_negatives#False_negative_error') False negative
  				td True negative
  