localStorage in iBooks without iTunes Author?

Dear Community

I'm trying to find a way to make localStorage work for a regular ePub3 file. The goal is to create an chapter1.xhtml, that will offer a quiz with a number of radio buttons and and a button that calls a JS funcion to store the value of those clicked buttons into an Array in localStorage (this works so far). On chapter2.xhtml there will be a button who calls this Array and will show the stored values via alert.

I finally made it work for readium and all available browsers. Sadly iBooks won't give me the chance to see if this all works, because it's not showing any alert at all. I also tried to write the values into an exisiting <p> - Section via an other JS function. No way to proof this, because iBooks won't show anything.

Does anyone have a solution for my problem? That would be awesome.