mastodon/app/views/application/mailer/_button.html.haml

%table.email-btn-table{ cellspacing: 0, cellpadding: 0, border: 0, role: 'presentation' }
  %tr
    %td.email-btn-td
      - if defined?(has_arrow) && !has_arrow
        = link_to text, url, class: 'email-btn-a email-btn-hover'
      - else
        = link_to "#{text} ➜", url, class: 'email-btn-a email-btn-hover'