Unfortunately,
You appear to be one of the growing minority of both iPad and iPhone users having this issue.
This is not a widespread iOS 11 issue.
Try the Aloha web browser.
Some users reported better success with that third party web browser.
Send feedback about this to Apple here.
iPad Feedback
http://www.apple.com/feedback/ipad.html
Cognizant Apple employees read ALL feedback generated from all of the various feedback pages and transfers the data to the proper and responsible Apple teams and personnel , but NO Apple employees will ever respond with any type of direct, individual replies from the feedback you post.
Good Luck to You!