How to turn keyboard off for a web tag?

I have a full-screen panel that contains a web tag and a panel that has a button that allows me to translate the screen away (close the screen). 

To start, I have google.com displayed in the web tag. If you tap in the google search textfield you get the keyboard, as you would expect.

If you use the screens close button to translate the screen away the keyboard stays up. 

I can't figure out what the target should be for closing the keyboard that was opened based on a textfield in the web page (google.com)