app/views/layouts/application.html.erb
<!DOCTYPE html>
<html lang="<%= I18n.locale %>" class="no-js">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title><%= content_for?(:title) ? yield(:title) : t('application.title', default: 'Translate your application.name') %></title>
<meta name="description" content="<%= content_for?(:description) ? yield(:description) : t('application.description', default: 'Translate your application.description') %>">
<%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track' => true %>
<%= javascript_include_tag 'vendor/modernizr' %>
<%= javascript_include_tag 'application', 'data-turbolinks-track' => true %>
<%= csrf_meta_tags %>
</head>
<body>
<header role="banner">
<%= render 'layouts/navigation' %>
</header>
<main role="main">
<%= render 'layouts/messages' %>
<%= yield %>
</main>
<footer role="contentinfo">
<%= render 'layouts/footer' %>
</footer>
</body>
</html>