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I think this is because of the fixed interval of the autoscroll feature. Maybe it would help to add some randomness after every scroll.

I've got this error on the console when running the gbppd.start command:

ƒ (){
            observer = new MutationObserver(callback);
            observer.observe(book, { attributes: true, childList: true, subtree: true });
            intervalId = setInterval(movePage, 500

Here is the log file.

books.google.mg-1632089861440.log
…

I get this issue when running gbppd.finish():

 Uncaught TypeError: o is null
    finish debugger eval code:1
    <anonymous> debugger eval code:1
debugger eval code:1:551

Uncaught TypeError: Cannot read properties of undefined (reading 'scrollHeight')
at :8:32
at :98:3

Thank you for this JavaScript. It was useful for downloading Esquisse d'une histoire de l'exégèse latine au moyen âge (1944), which previews 100% of his pages, yet for some reason there is no PDF download option ("No eBook available").

Are there other books on Google Books that preview 100% of the pages yet don't have a PDF download option?

Hi,

I tried using the script today, but I got an error due to the class overflow-scrolling not being found, here is the error in Chrome:

In Firefox:

Uncaught TypeError: l[0] is undefined
gbppd debugger eval code:1
debugger eval code:1