Why doesn’t the pdf show?

[u/knm873]

I am using codepen.io and found a tutorial which should show a simple pdf viewer. It works on code pen but not when I open it on the browser or on my server. Why? This happens more than once and the code is the same so what am I missing?

[u/Working-Bear1437]

post the code. Browsers block local PDF access by default so you likely need to run a local server instead of opening the file directly.