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features should go into the dev version.

This seems very pointless to me, there should never be a lone tab on any page, ever.

Please offer a better reason than "client design".

agreed. this does not sound like a good idea.

I have a design requested of me where I need one tab. It preserves the look and feel of our other pages which also use tabs. So for now we'll use jquery to hide the 'phantom' tab necessary to achieve this in Drupal. I've re-opened this issue, to second the need for this functionality.

For those landing on this page in search of a solution due to clients that insist on one tab, like my employer, this jquery will get rid of the second "phantom tab" you need to create for this effect:

if (Drupal.jsEnabled) {
    $(document)
            .ready(function() {
               $('ul.tabs li:eq(1)').hide();
            });
              
};

added signature