jQuery append only works if I select html in admin section [closed]

These three lines work as expected , There is a problem maybe with other code before these lines that prevent the execution of your script;

In case just fire the browser console in this page and try them here

$( "html" ).append( "<div id='bf_rsvp_note_display'></div>" );
$( "body" ).append( "<div id='bf_rsvp_note_display'></div>" );
$( ".topbar" ).append( "<div id='bf_rsvp_note_display'></div>" );