docs/manual/source/partials/head/_javascripts.html.slim

/[if lt IE 9]
  = javascript_include_tag '//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.2/html5shiv.min.js'
= javascript_include_tag '//cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML'
= partial 'google_analytics'

/azo sans font 
= javascript_include_tag '//use.typekit.net/mut4mjx.js' 
javascript:
  try{Typekit.load();}catch(e){}