[Webkit-unassigned] [Bug 118614] New: The CSS background-* property is ignored on <video> with JPEG poster

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=118614

           Summary: The CSS background-* property is ignored on <video>
                    with JPEG poster
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.8
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: marc.hoyois at gmail.com


Created an attachment (id=206570)
 --> (https://bugs.webkit.org/attachment.cgi?id=206570&action=review)
minimal test case

Overview:

If a <video> has a JPEG poster image that does not exactly fit the dimensions of the element, the remaining space is always painted white, no matter the value of the CSS background property.
This leads to undesirable visual quirks, for instance:

1. The CSS background is shown before the poster metadata is downloaded,
2. It turns white while the poster is shown,
3. As soon as the video starts playing, the CSS background is shown again,

and this happens in quick succession if the video is on autoplay.

On the other hand, if the poster is a PNG image, the CSS background is shown, so this issue might be an intended behavior for images that have no transparency. But I think the above scenario shows that the current behavior is undesirable.

Steps to reproduce:

Check the attached minimal test case.

Actual Results:

The background is red at first, then turns white when the poster is loaded, and then back to red when the video starts playing

Expected Results:

The background should be red all along.

Build Date & Platform: r152590 on OS X 10.8.4.

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