Jupyter Notebook shows pdfs from others sites but not local pdfs

[sindzicat]

Hello.

When I try:

%%html
<iframe src="http://window.edu.ru/resource/460/77460/files/gorbunov_pos.pdf" width='100%' height='600px'>

all works fine.

When I try with local pdfs, I see nothing. In chrome devtools I see:

1.pdf:1 Failed to load 'http://localhost:8888/files/1.pdf' as a plugin, because the frame into which the plugin is loading is sandboxed.
content.js:565 Uncaught TypeError: Cannot read property 'appendChild' of null
    at content.js:565
(anonymous) @ content.js:565

Why?

Best regards,
Andrey.

[bryango]

See #3652. I'm also frustrated about this but it seems that there is nothing we can do.