Double-click on the font file - a window will open with a font overview. 
I didn t say there is a dynamic viewport optimization. 

https://replit.com/@tocom1980/Download-Mirrored-Murder-Book-One-Epub
https://replit.com/@tocom1980/Download-Nice-Day-for-a-Norse-Wedding-and-Other-Stories-Epub
https://replit.com/@tocom1980/Download-The-Antichrist-Epub
https://replit.com/@telltar1978/Download-The-Return-of-the-Soldier-Epub
https://replit.com/@telltar1978/Download-Pet-Epub
https://replit.com/@clasur1989/Download-Courage-Epub
https://replit.com/@clasur1989/Download-Henry-IV-Part-1-Epub-1
https://replit.com/@maxi1971/Download-I-promessi-sposi-Epub
https://replit.com/@tocom1980/Download-Dog-Heaven-Epub
https://replit.com/@tocom1980/Download-Hunted-and-Harried-Esprios-Classics-Epub
https://pastelink.net/2dvho4yj
https://paste2.org/
https://paste2.org/0zy3eObW
https://techplanet.today/post/talga-na-ma-b-ra
https://www.geany.org/p/k8icC/
https://pastelink.net/2i1e8swr