HTML5 Output do not work with iframes

Hi,
I have big problems with the Unreal Engine 4 HTML5 output. I integrated a HTML5 project output for testing purposes via an iframe into my WordPress site.

Unfortunately the keyboard input is not forwarded to the iframe. I tested many Java and HTML scripts. These scripts are working fine with normal websites. They are forwarding keystrokes correctly to the iframe. But this do not work with the Unreal HTML5 output. I am really disappointed that this thing makes so much trouble.

I found also no solution to hide the HTML5 interface. Customers do not want to see this. I need a clean integration of the screen via an iframe into a definite website. The mouse navigation makes also trouble. When I reach the border of the screen the mouse navigation stops working. At this time a Firefox message appears asking me if I want to hide the mouse pointer. This is not a useful solution. Is there a way to get a good mouse navigation without these problems?

Best regards, Andreas