scripts and stylesheets placement in layout (rails)

application.html.haml

// https://developers.google.com/speed/docs/best-practices/rtt#PutStylesBeforeScripts

!!!
%html
  %head
    ...
    // stylesheet loads first
    = stylesheet_link_tag 'application'
    // main javascript file is loaded in parallel with stylesheet
    = javascript_include_tag 'application'
    ...
  %body
    ...
    %footer
      // external and additional javascript
      = yield :inline_js