openlibrary/templates/site/body.html

$def with (page)

$ bodyclass = ctx.get('bodyclass', [])
$ show_ol_shell = ctx.get('show_ol_shell', True)
$ bodyattrs = ctx.get('bodyattrs', [])

$if show_ol_shell and (ctx.path.startswith('/works/OL') or ctx.path.startswith('/authors/OL') or ctx.path.startswith('/books/OL') or ctx.path.startswith('/search')):
  $if ctx.user and ((ctx.user.is_librarian() or ctx.user.is_admin())):
    $bodyclass.append('show-librarian-tools')
    $bodyattrs.append('data-username="%s"' % ctx.user.key.split('/')[-1])

<body class="$(' '.join(bodyclass))" $:(' '.join(bodyattrs))>
  <script>
      // Provide a signal that JS will load
      document.body.className += ' client-js';
  </script>
  <span id="top"></span>
  <div id="offline-info">$_("It looks like you're offline.")</div>
  $# on form pages e.g. manage-covers, add-cover we do not display the header
  $# this is consistent with version 1.
  $if show_ol_shell:
    $:render_template("site/alert")
    $:render_template("lib/nav_head", None)
  $# don't render test-body-mobile for iframes
  <div $:('id="test-body-mobile"' if show_ol_shell else '')>
    $if show_ol_shell:
      $#print errors (hidden by default as styles are loaded via JS)
      <div class="flash-messages">
      $for flash in get_flash_messages():
        <div class="$flash.type"><span>$:flash.message</span></div>
      </div>
      $# Announcement banner will only be rendered if announcement and storage_key variables are set.
      $# Be sure to escape any single quotes inside of the announcement HTML string.
      $ announcement = ''
      $# Include date in cookie name to avoid name collisions (something like '{prefix}{YY}{MM}{DD}' would work well)
      $ cookie_name = ''
      $if announcement and cookie_name:
        $:render_template('site/banner', announcement, cookie_name, cookie_duration_days=30)
    $:page
  </div>