[Webkit-unassigned] [Bug 236616] New: Data URI favicon doesn't seem to work

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=236616

            Bug ID: 236616
           Summary: Data URI favicon doesn't seem to work
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Intel)
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: eric.case at gmail.com
                CC: sabouhallawa at apple.com

I've documented my attempts to get this working in this repo: https://github.com/case/safari-favicons-base64

I tried the suggestion in this Stack Overflow post: https://stackoverflow.com/a/5199989/890466 -- which suggests that this worked in Mac Safari back in 2011. Perhaps something related has changed or broken since then?

This snippet works fine in latest (as of filing this bug report) Mac Chrome and Firefox:

<link rel="icon" href="data:image/png;base64,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" />

But for some reason I haven't been able to get it working in Safari.

I also have a related Twitter thread about this with @othermaciej here: https://twitter.com/othermaciej/status/1493336261901238272?s=21

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