I copy-paste the source from this example: https://mozilla.github.io/pdf.js/web/viewer.html
My Code example (No docs so I follow the source code):
https://codepen.io/ezra_siton/pen/bGdMPqe

I don't find any call to PDF url under the official example (Filename is: compressed.tracemonkey-pldi-09.pdf) + The docs missing + Zero examples out there (Codepen/Jfiddle).
I am searching for the most basic hello-world example (Very weird "unusable" docs for pdf.js ==> "can't see the forest for the trees").
The official examples here not helpful (Where is the UI bar?): https://mozilla.github.io/pdf.js/examples/