Bug 259361 - STP advertises support for JXL but can't decode them
Summary: STP advertises support for JXL but can't decode them
Status: RESOLVED DUPLICATE of bug 258655
Alias: None
Product: WebKit
Classification: Unclassified
Component: Images (show other bugs)
Version: Safari Technology Preview
Hardware: Mac (Apple Silicon) macOS 13
: P2 Normal
Assignee: Nobody
URL: https://cloudinary.com/blog/jpeg-xl-h...
Keywords:
Depends on:
Blocks:
 
Reported: 2023-07-20 09:50 PDT by Jon
Modified: 2023-07-20 13:27 PDT (History)
2 users (show)

See Also:

Attachments
Screenshot of broken site. (593.78 KB, image/png)
2023-07-20 09:50 PDT, Jon 		no flags Details
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Description Jon 2023-07-20 09:50:32 PDT 
Created attachment 467079 [details]
Screenshot of broken site.

Starting with STP based on Safari 17, STP, even on Ventura, advertises support for JXL, both in requests and release notes. However, downloaded JXL files can't be displayed, leading to broken images on screen. For instance, the recent JXL article from Cloudinary (https://cloudinary.com/blog/jpeg-xl-how-it-started-how-its-going) supports JXL for almost all images but is broken in STP (on Ventura). If Ventura can't support JXL then STP shouldn't advertise it. This is the accept header for the image request:  image/webp,image/avif,image/jxl,image/heic,image/heic-sequence,video/*;q=0.8,image/png,image/svg+xml,image/*;q=0.8,*/*;q=0.5
Comment 1 Alexey Proskuryakov 2023-07-20 13:13:47 PDT 
Thank you for the report. This is a bug, STP should be able to display JPEG XL.

*** This bug has been marked as a duplicate of bug 258655 ***
Comment 2 Jon 2023-07-20 13:18:30 PDT 
Sorry for the dupe. Neither bugzilla nor Google search turn up that bug when searching for JPEG XL.
Comment 3 Alexey Proskuryakov 2023-07-20 13:27:06 PDT 
No problem. For completeness, Safari 17 beta 3 should support JPEG XL on both macOS Ventura and macOS Monterey, too. Which is indeed the case on Monterey in my testing (I didn't try Ventura).