[Webkit-unassigned] [Bug 219977] WebP loading error in Safari on iOS 14.3

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219977

--- Comment #10 from Eric Portis <e at ericportis.com> ---
Re: Perry in Comment #9

When I replace "416" with "200" I actually get a PNG back instead of a WebP? Not sure what decision making is happening on the server...

---

I compiled all of the example images here, plus a couple that we've received from Cloudinary customers:

https://ericportis.com/etc/broken-webps/

The one pattern that jumps out to me is that most of the broken images seem to have palletized color information in some channel; sometimes in the alpha channel (e.g., "lamp"), other times in color channels (e.g., "stripes", "chessboard").

Two possible exceptions are "blue" and "text". Looking at the image content I would kind of expect indexing (they both have very limited color palletes), but their webpinfos don't mention indexing as a transform, as every other image does...

If anyone from Apple could confirm our understanding of which versions of MacOS and iOS are affected, or share any information that could give us a sense of either the scale or cause of the problem, it would be *very* helpful.

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