<%%= amp_html_doctype do %> <%%= amp_head %> <%% if content_for? :title %><%%= yield :title %><%% else %><%%= amp-html.application_name %><%% end %> <% if options[:split] %> <%%= canonical_document_link(url_for(format: :html, only_path: false)) %> <% else %> <%%= canonical_document_link %> <% end %> <%%= csrf_meta_tags %> <%%= schema_tag("#{headline if content_for? :title}": "#{yield :title if content_for? :title}") %> <%%= amp_css do %> <%% end %> <%%= yield %> <%% end %>