How do I show the keyboard in a web console on an i[Phone|Pad]

Hi all,

so I know how I can allow displaying the web console on a mobile device (iPhone or iPad in my case) by putting

config.web_console.whitelisted_ips = %w(0.0.0.0/0 ::/0)

in config/environments/development.rb. Then the console is displayed on other devices in the local network.
However on my iPhone/Pad the keyboard isn't shown as well.

Does anybody know how to get that keyboard to be displayed, when the console is tapped?