head
  meta charset='utf-8'
  title = page_title
  meta name='description' content='#{page_description}'
  meta name='keywords' content='#{page_keywords}'
  meta name='author' content=''
  meta http-equiv='X-UA-Compatible' content='IE=edge'
  meta content='on' http-equiv='cleartype'
  meta content='True' name='HandheldFriendly'
  meta content='320' name='MobileOptimized'
  meta content='initial-scale=1, user-scalable=yes, width=device-width' name='viewport'
  link rel='shortcut icon' href='#{image_path('favicon.png')}'
  = stylesheet_link_tag 'application.css', media: 'all'
  /[if lt IE 9]
    = javascript_include_tag 'ie-lt-9'
  = yield_content :head

head
  meta charset='utf-8'
  title = page_title
  meta name='description' content='#{page_description}'
  meta name='keywords' content='#{page_keywords}'
  meta name='author' content=''
  meta http-equiv='X-UA-Compatible' content='IE=edge'
  meta content='on' http-equiv='cleartype'
  meta content='True' name='HandheldFriendly'
  meta content='320' name='MobileOptimized'
  meta content='initial-scale=1, user-scalable=yes, width=device-width' name='viewport'
  link rel='shortcut icon' href='#{image_path('favicon.png')}'
  = stylesheet_link_tag 'application.css', media: 'all'
  /[if lt IE 9]
    = javascript_include_tag '//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7/html5shiv.min.js'
  / -------------------------------------
  / Modernizr - Development version
  / Use the Development version to develop with and learn from. Then, when you’re
  / ready for production, use the build tool below to pick only the tests you need.
  / -------------------------------------
  = javascript_include_tag '//cdnjs.cloudflare.com/ajax/libs/modernizr/2.8.2/modernizr.js'
  = yield_content :head

Add html5shiv polyfill using cdn. Add Modernizr development version using CDN. Adding comments to explain that the user needs to build its own version for production.
Add html5shiv polyfill using cdn. Add Modernizr development version using CDN. Adding comments to explain that the user needs to build its own version for production.

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