Many years ago I wanted to build an Issuu-like PDF viewer (https://issuu.com/ https://issuu.com/) built on top of pdf.js and spent a lot of time manually doing

Many years ago I wanted to build an Issuu-like PDF viewer (https://issuu.com/ https://issuu.com/) built on top of pdf.js and spent a lot of time manually doing CSS transformations. Eventually, I gave up because I couldn't get pdf.js to be fast enough and the experience wasn't as slick as what Issuu had. I wonder if it would be a lot easier now! Back then, Issuu was written in flash, I'm guessing they've since switched to CSS as well :)