[docs] iframe keyboard not working

I've tried on Chrome and Firefox and both have the same behavior.

if I open the demo directly:
http://esenthel.com/site/Esenthel%20Fantasy%20Demo/Esenthel%20Fantasy%20Demo.html
Then keyboard works OK.
Click on "Menu / Options" and you can type something in the "Gui Scale" textfield in the menu window.
or you can close it with "Escape" key.

But if I open the page through an iframe:
http://www.esenthel.com/?id=live_demo
Then keyboard doesn't work anymore, I press keys and nothing happens.

I use the following code:
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