PDF.js library redeveloped for thsconline.
There are two versions of viewer.js:
The viewer_custom.js is modified specifically to handle base-64 data on a particular variable. It behaves kind of like a browser within a browser. A Google App Script is used to pass the data from the web into the PDF viewer / browser application.
The viewer_external.js is a standard PDF.js file, can be used to handle PDF files hosted on thsconline.github.io itself.
The stylesheet has been modified to a blue theme, reflecting style choices made on the main thsconline/s/ repo.