How to give focus to an iFrame in firefox just page is loaded?

Question

How to give focus to an iFrame in firefox just page is loaded?

FYI: I tried focus() javascript & jQuery functions to do this, works properly for XP, but doesn't work for Windows 7?
Also, how does foucs() functionality differs from platform to another one?

Answer 1

try to trigger the focus or focusin event on page/dom ready.

$(document).ready(function(){
  $('iframe').trigger('focusin');
});