GeoGebra Widgets for iBooks Author dont's work on (iOS 11) iBooks
Solved
I upgraded iOS on iPad from version 10 to 11.
GeoGebra iBooks Widget (HTML Widget) that worked on iOS 10 iBooks does not work on iOS 11 iBooks .
HTML Widge frames gets all white and is not displayed.
Is this bug a bug in iBooks or GeoGebra Widget ?
(It seems like a problem with iBooks and iBooks Author.)
The same problem 
In iOS 11 iBooks, tap on the widget, the following message window will appear.
"Authorize widget to load external content?"
about:blank
Cancel or Authorize
If you select Cancel here, the off-line GeoGebra widget seems to work normally.
If you accidentally choose Authorize, it will not work.
I have to do just the same to make it work.
This problem was solved in iOS 11.2.
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