RESOLVED MOVED 222112
WebKit renders APNGs with corrupted palettes 
https://bugs.webkit.org/show_bug.cgi?id=222112
Summary WebKit renders APNGs with corrupted palettes
trashboyjet
Reported 2021-02-18 08:59:12 PST
Created attachment 420835 [details] Test Case Reduction It appears that WebKit has issues with rendering certain .apng files. I've tested on multiple browsers utilizing WebKit, with a few images, and they generally have corrupted palettes/flickering that does not occur on non-WebKit browsers. To reproduce this error, simply visit one of the pages attached to this report. It should happen consistently. By doing the above, you'll see the .apng file flicker or have transparency/palette corruption. The expected result is to have this function as it does on any non-WebKit browser. Here's 4 different WebKit browsers I tested on where the issue consistently occurs: - Safari 14 (macOS) - Safari 14 (iOS) - Firefox 31 (iOS) - Chrome 87.0.4280.77 (iOS) I've also tested non-WebKit browsers, and the issue isn't present: - Firefox 85.0.2 (Windows) - Chrome 88.0.4324.150(Windows) - Firefox 85.0.1 (macOS) - Chrome 88.0.4324.182 (macOS) - Brave 1.19.86 (macOS) If you need any more information, please let me know.
Attachments
Test Case Reduction (182 bytes, text/html)
2021-02-18 08:59 PST, trashboyjet 		no flags
Details
Test Case Reduction (183 bytes, text/html)
2021-02-19 12:45 PST, trashboyjet 		no flags
Details
Show Obsolete (1) View All Add attachment proposed patch, testcase, etc.
trashboyjet
Comment 1 2021-02-19 12:45:00 PST
Comment on attachment 420835 [details] Test Case Reduction ><!DOCTYPE html> ><html> > <head> > <title>Test Case Reduction</title> > </head> > > <body> > <img src="https://bobatealee.com/hosting/webkitbug/ohyeah.png"></img> > </body> ></html>
trashboyjet
Comment 2 2021-02-19 12:45:58 PST
Created attachment 421015 [details] Test Case Reduction
Alexey Proskuryakov
Comment 3 2021-02-19 18:41:26 PST
It almost looks intentional on this example, but comparing to other browsers, it's not.
Simon Fraser (smfr)
Comment 4 2021-02-19 19:09:48 PST
rdar://74547307
Simon Fraser (smfr)
Comment 5 2021-02-19 19:09:59 PST
Tracked internally.
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