[Webkit-unassigned] [Bug 239961] New: <video> poster attribute allows another video

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239961

            Bug ID: 239961
           Summary: <video> poster attribute allows another video
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Apple Silicon)
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: opendarwin at lapcatsoftware.com

Created attachment 458674

  --> https://bugs.webkit.org/attachment.cgi?id=458674&action=review

Sample HTML reproduction

The <video> poster attribute is supposed to be an image, but Safari allows and plays a video as the poster attribute. It's videos all the way down! And the poster video is auto-played (silently) even when Never Auto-Play is set in Safari's Auto-Play Preferences.

This bug only occurs in Safari. Chrome and Firefox do not show or play a poster video.

I'm testing with Safari Version 15.4 (17613.1.17.1.13) on macOS Version 12.3.1, M1 MacBook Pro.

Attached is a sample HTML file reproducing the issue.

I discovered this bug from an advertisement on cnn.com that wasn't respecting Safari's Auto-Play preferences, but I can't find the specific ad anymore.

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