Bug 191782

Summary: CSP can block Safari’s default media player UI icons
Product: WebKit Reporter: Daniel <code>
Component: New BugsAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal CC: bfulgham, chall0, dante3333, dbates, dino, d_vine_me, graouts, lodeclaassen, moirelein, sierkb, sprbeheer, webkit-bug-importer, webkit
Priority: P2 Keywords: InRadar
Version: Safari Technology Preview   
Hardware: Unspecified   
OS: macOS 10.14   
See Also: https://bugs.webkit.org/show_bug.cgi?id=225865
Description Flags
Screenshot none

Description Daniel 2018-11-16 15:22:43 PST
Created attachment 355140 [details]

Set the following Content-Security-Policy (CSP) header:
default-src 'none'; img-src 'self'; media-src 'self'; report-uri http://localhost/csp-reports

And a sample document:
<video autoplay controls>
  <source src="./video.mp4" type="video/mp4">

Expected results:
The video should load and start auto playing. When hovering the video, you should see standard controls and be able to interact with them. This is browser UI and should just work. Works fine in Chromium and Firefox.

Actual results:
The video will autoplay and the default UI toolbars will display. However, the button icons are invisible and the user can’t interact with them. Safari also reports a CSP violation about having blocked data:image/svg files to http://localhost/csp-reports
Comment 1 Radar WebKit Bug Importer 2018-11-17 12:16:14 PST
Comment 2 moirelein 2019-07-16 01:19:22 PDT
As a workaround I use the CSP policy `img-src 'self' data:`
Comment 3 TokerX 2020-10-04 06:49:52 PDT
The same happens in Chrome on iOS, so it's not a Safari bug, but most likely, as usual, one of Apple's weird policies.