mastodon/app/views/layouts/embedded.html.haml

!!! 5
%html{ lang: I18n.locale }
  %head
    %meta{ charset: 'utf-8' }/
    = stylesheet_link_tag 'application', media: 'all'
    = javascript_pack_tag 'public', integrity: true, crossorigin: 'anonymous'
  %body.embed
    = yield