Bug 255900

Summary:	Regression(255052@main) Some streaming sites fail with an Embedded Video Sandbox Browser Error
Product:	WebKit	Reporter:	Chris Dumez <cdumez>
Component:	WebCore Misc.	Assignee:	Chris Dumez <cdumez>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	darin, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Chris Dumez 2023-04-24 18:48:16 PDT

Some streaming sites fail with an Embedded Video Sandbox Browser Error since 255052@main.
255052@main seems correct per the specification but exposing the "Chrome PDF Viewer" caused those sites to use a different code path for validating iframe sandboxing.
They now try to load a data URL with a pdf MIME type inside an <object> element and this fails on iOS.

Comment 1 Chris Dumez 2023-04-24 18:48:30 PDT

<rdar://107795151>

Comment 2 Chris Dumez 2023-04-24 19:31:45 PDT

Pull request: https://github.com/WebKit/WebKit/pull/13128

Comment 3 EWS 2023-04-25 09:58:15 PDT

Committed 263377@main (2c5a97645ec0): <https://commits.webkit.org/263377@main>

Reviewed commits have been landed. Closing PR #13128 and removing active labels.