Bug 307681

Summary: YouTube fullscreen video cropping
Product: WebKit Reporter: Jeff Johnson <opendarwin>
Component: MediaAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: fred.wang, jer.noble, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: Safari 26   
Hardware: Mac (Apple Silicon)   
OS: Unspecified   
Bug Depends on:    
Bug Blocks: 276855    
Attachments:
Description Flags
Screenshot of the bug
none
Screenshot of the uncropped video none

Jeff Johnson
Reported 2026-02-12 09:06:31 PST
Created attachment 478327 [details] Screenshot of the bug Some YouTube videos are cropped on the left and right when they enter fullscreen. Steps to reproduce: 1. Open https://www.youtube.com/watch?v=IIqtuupvdWg in Safari 2. Control-double-click on the video to open the Safari native contextual menu rather than the YouTube custom contextual menu 3. Select Enter Full Screen from the contextual menu Expected results: The video shows the black and white border on the left and right sides. Actual results: The left and right sides are cropped. Compare with the second screenshot of YouTube full screen mode, triggered by the "f" key, which puts a container element into fullscreen rather than just the video. The issue may be specific to retina displays or to certain Mac models. I can reproduce on a 16-inch M4 Pro MacBook Pro but not on an M1 Mac mini with a non-retina display. Another person has confirmed that they can reproduce on a 15-inch M4 MacBook Air.
Attachments
Screenshot of the bug (511.28 KB, image/png)
2026-02-12 09:06 PST, Jeff Johnson 		no flags
Details
Screenshot of the uncropped video (522.59 KB, image/png)
2026-02-12 09:07 PST, Jeff Johnson 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Jeff Johnson
Comment 1 2026-02-12 09:07:00 PST
Created attachment 478328 [details] Screenshot of the uncropped video
Radar WebKit Bug Importer
Comment 2 2026-02-12 14:30:28 PST
<rdar://problem/170264063>
Frédéric Wang Nélar
Comment 3 2026-10-30 02:04:48 PDT
I cannot reproduce on my mac, but the description says it may be specific to retina displays or to certain Mac models. @Jeff Johnson do you still see the issue?
Jeff Johnson
Comment 4 2026-10-30 04:14:46 PDT
(In reply to Frédéric Wang Nélar from comment #3) > I cannot reproduce on my mac, but the description says it may be specific to > retina displays or to certain Mac models. @Jeff Johnson do you still see the > issue? Yes, I still see the issue in Safari 27.2
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