[Webkit-unassigned] [Bug 218391] New: Transparent video poster image doesn't keep element transparent once first frame is preloaded

Fri Oct 30 09:51:21 PDT 2020

https://bugs.webkit.org/show_bug.cgi?id=218391

            Bug ID: 218391
           Summary: Transparent video poster image doesn't keep element
                    transparent once first frame is preloaded
           Product: WebKit
           Version: Safari 14
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: hello at romaricpascal.is

In Safari 14, setting a transparent poster image on a video with `preoload="auto"` no longer keeps the video element transparent once the first frame gets loaded, as it did in the previous versions of Safari. The element remains transparent if `preload` is `none` or `metadata`, though.

To reproduce:

Open the following page in Safari

```
<html>
  <title>Test video player</title>
  <body>
  <h1>Test video player</h1>
  <video controls
    src="https://archive.org/download/BigBuckBunny_124/Content/big_buck_bunny_720p_surround.mp4"
    poster="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7399w"
    preload="auto"
    width="640">
  </video>
  </body>
</html>
```

Actual result:

Once the video preloads enough data, the element's background turns black

Expected result:

The element remains transparent.

Build & Hardware:

Version 14.0 (15610.1.28.1.9, 15610) on Mac OS 10.15.6

Additional builds & Platforms:

Doesn't happen on Version 13.1.12 (15609.3.5.1.3) on Mac OS 10.15.6

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