I'm wondering why it isn't working on your iPad. This is not a new feature, as far as I know. I found instructions describing it from 2010.
The only thing you still could try, is something you've certainly seen very often in iPF:
Reset, restart your iPad and force close all apps, (perhaps even delete History, Cookies and Data), then try again.
Reset: press and hold Home and Power button until the Apple logo appears.
Restart: turn off your device, turn it on again.
Force close apps: double tap the Home button to show the multitask bar, tap and hold one of the apps until it starts to wiggle, delete all apps there.
Delete History, Cookies and Data in Settings - Safari.