<!DOCTYPE html>
<html lang="en">
  <head>
    <title><%%= page_title %></title>
    <%%= stylesheet_link_tag "application", media: "all", "data-turbolinks-track" => true %>
    <%%= csrf_meta_tags %>
  </head>

  <body class="<%%= body_class %>">
    <%%= yield %>
    <%%= javascript_include_tag "application", "data-turbolinks-track" => true %>
  </body>
</html>

<!DOCTYPE html>
<html lang="<%= I18n.locale %>">
  <head>
    <meta charset="utf-8" />
    <meta name="ROBOTS" content="NOODP" />
    <meta name="viewport" content="initial-scale=1" />
    <title><%%= page_title %></title>
    <%%= stylesheet_link_tag "application", media: "all" %>
    <%%= csrf_meta_tags %>
  </head>

  <body class="<%%= body_class %>">
    <%%= yield %>
    <%%= javascript_include_tag "application" %>
  </body>
</html>

Add charset, viewport scaling; remove Turbolinks
Add charset, viewport scaling; remove Turbolinks
