Today I had to set to more than 800 pixels the height of my tab. I found here a simple solution, thanks a lot to Amit Jain.
Steps in brief:
- in the app “canvas settings” set the height to “Settable”, like in the image shown below.
- add to the <body> line: style="overflow: hidden" (to remove the scrollbars)
- add to your main <div> (the one that contains your html) the style: style="height:2000px; width:520px;" – obviously you will set your desired height
- finally, just below the <body> tag, add this code:
<div id="fb-root"></div>  
<script>  
  window.fbAsyncInit = function() {  
 FB.Canvas.setAutoResize();  
  };  
  (function() {  
 var e = document.createElement('script'); e.async = true;  
 e.src = document.location.protocol + '//connect.facebook.net/en_US/all.js';  
 document.getElementById('fb-root').appendChild(e);  
  }());  
</script>  
that’s it – worked for me!
 











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