As of July 2023, this app is no longer in use at NYPL, and the current implementation is https://github.com/NYPL-Simplified/web-reader. Please contact the eReading team in Digital for more information. For NYPL developers, please see additional documentation on Confluence.
A viewer application for web publications, based on Hadrien Gardeur's proof of concept https://github.com/HadrienGardeur/webpub-viewer.