jQuery Set data-mini Attribute For All Form Inputs

Hello, 

I'm almost done developing my custom theme for when I migrate our Greenstone digital collections over to Omeka. I've built in a mobile interface for when a mobile device is detected and have been having a lot of fun implementing that with jQuery Mobile. 

I prefer to make most stuff "mini" ala the jQuery Mobile data-mini attribute. Works fine when I'm editing the actual html source, but the following won't work for some reason: 

   $(document).ready(function() { 
      $('input').attr('data-mini', 'true'); 
   }); 

I can set other attributes successfully like: (just as a test) 

   $(document).ready(function() { 
      $('input').attr('data-mini', 'true'); 
      $('input').attr('style', 'background:yellow'); 
   }); 

But for some reason it won't do the data-mini attribute... why? 
Gavin Spomer
Systems Programmer
Brooks Library
Central Washington University