Go to https://6-classic.demo.plone.org/@@overview-controlpanel and look at page source. You'll see:
<title>demo.plone.org</title><title>Actions</title><title>Add-ons</title><title>Date and Time</title><title>Discussion</title><title>Language</title><title>Mail</title><title>Navigation</title><title>Search</title><title>Site</title><title>Social Media</title><title>Syndication</title><title>Theming</title><title>TinyMCE</title><title>URL Management</title><title>Content Rules</title><title>Content Settings</title><title>Content Types</title><title>Editing</title><title>Image Handling</title><title>Markup</title><title>Relations</title><title>Groups</title><title>Member Fields</title><title>User and Group Settings</title><title>Users</title><title>Errors</title><title>HTML Filtering</title><title>Security</title><title>Configuration Registry</title><title>Maintenance</title><title>Management Interface</title><title>Resource Registries</title><title>Actions</title><title>Add-ons</title><title>Date and Time</title><title>Discussion</title><title>Language</title><title>Mail</title><title>Navigation</title><title>Search</title><title>Site</title><title>Social Media</title><title>Syndication</title><title>Theming</title><title>TinyMCE</title><title>URL Management</title><title>Content Rules</title><title>Content Settings</title><title>Content Types</title><title>Editing</title><title>Image Handling</title><title>Markup</title><title>Relations</title><title>Groups</title><title>Member Fields</title><title>User and Group Settings</title><title>Users</title><title>Errors</title><title>HTML Filtering</title><title>Security</title><title>Configuration Registry</title><title>Maintenance</title><title>Management Interface</title><title>Resource Registries</title>
which means 65 <title> tags in the head.
)
