CSP sandbox policy header disables built-in media player

• Component: Media
• Status: RESOLVED DUPLICATE

[[e-mail]]

We have encountered problems with introducing "Content-Security-Policy: sandbox" header to some resources.
The issue is described here: https://jira.atlassian.com/browse/JRASERVER-72275.

Steps to reproduce:
1. Request for audio/video file and get a response with "Content-Security-Policy: sandbox" HTTP header set.

Actual results:
1. Console shows: "Blocked script execution in 'http://localhost:8080/secure/attachment/10000/100MBVideo.mp4' because the document's frame is sandboxed and the 'allow-scripts' permission is not set."
2. The video does not play.

Expected results:
1. Video plays without issues.

Workaround:
1. Set "Content-Security-Policy: sandbox allow-scripts" header for affected browsers.


The same issue occurs both in OS X and iOS versions of Safari, as well as iOS version of Chrome, thus we think that the problem lies within WebKit itself.
Firefox on OS X works without any issues. However, Chrome for OS X requires `allow-same-origin` instead of `allow-scripts` to function properly.

Could you please confirm if this is a bug or desired behaviour?

[Radar WebKit Bug Importer]

<rdar://problem/78394877>

[Anne van Kesteren]

It's not desired behavior. It appears this was fixed by bug 223422. Please comment/reopen if that's not the case.

*** This bug has been marked as a duplicate of bug 223422 ***