Bug 258672

Created attachment 466866 [details] Image showing comparison of the two renderings (prior Safari vs 17.0 Beta 2) Overview: I was testing the new iPadOS 17.0 Beta 2 (21A5268h) and noticed a bug in how Canvas rendered layered images. I hadn't noticed this issue in 17 Beta 1 (or any prior version of Safari/WebKit), so I believe it was introduced in Beta 2. The bug can be seen at this URL using an iPad on 17.0 Beta 2: https://webkit-canvas-test.pages.dev Steps To Reproduce: The code at the link above loads a photo of a man (man.jpeg) to the canvas and then loads another image (noise.png) on top of that. The second image is of a subtle noise pattern that should render across the canvas. Actual Results: On iPadOS 17 Beta 2, the canvas renders a man covered in an INTENSE noise pattern. It is almost as if globalCompositeOperation is something other than the default. What You Should See: All prior versions of Safari/Webkit will just show a man holding a frying pan with a subtle amount of noise on the image (see attached). The latest Safari Technology Preview release 173 on my MacBook Pro renders this correctly as well. I do not have an iPhone to test on this release yet though, so the bug may be on both iOS and iPadOS. Build: Issues seen on iPadOS 17.0 (21A5268h) on an iPad Mini 6th Generation