RESOLVED MOVED258686
[iOS 17] PNG image transparency is broken 
https://bugs.webkit.org/show_bug.cgi?id=258686
Summary [iOS 17] PNG image transparency is broken
Jacob Goldman
Reported 2023-06-29 11:19:45 PDT
Created attachment 466867 [details] iOS 17.0 in Safari navigated to https://jsbin.com/rowohenaji?html,css,output PNGs with any alpha channel set below around 0.5 has no effect. Pixels with an alpha channel of 0 are still visible, breaking transparent backgrounds. All PNGs seem to be impacted across the entire web. Example: https://jsbin.com/rowohenaji?html,css,output. See attachment for iOS 17.0 reproduction showing pink overlays on all elements. Only reproducible on iOS 17.0, cannot reproduce on macOS Ventura 13.4 with Safari Release 172 (Safari 17.0, WebKit 18616.1.17.3). I am unable to reproduce this on iOS outside of WebKit (verified in Safari and WKWebView). See also: * highly visible bug in Google Ads: https://redd.it/14kda07 * similar bug reported on Amazon.com: https://bugs.webkit.org/show_bug.cgi?id=258454.
Attachments
iOS 17.0 in Safari navigated to https://jsbin.com/rowohenaji?html,css,output (60.60 KB, image/jpeg)
2023-06-29 11:19 PDT, Jacob Goldman 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Alexey Proskuryakov
Comment 1 2023-06-29 14:58:35 PDT
Thank you for the report! This is an issue below WebKit, tracked by Apple internally as rdar://110822373.
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