Injecting HTML on (arbitrary) admin pages

If you check out the source of the /wp-admin/admin-header.php page you find the following actions:

Inside div#wpbody:

  • in_admin_header,

Inside div.wpbody-content:

  • network_admin_notices
  • user_admin_notices
  • admin_notices
  • all_admin_notices

I’m not sure what you mean by the right location, but I guess the all_admin_notices action would be the most suitable one for you?

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