Since Minefield has now included gradient, the background in the webkit example is "off color" rather than white, http://trac.webkit.org/browser/trunk/LayoutTests//fast/gradients/simple-gradients.html?format=raw shows a non-white background (note theres no background-color specified) Here is a comparison between the 2 engines. http://img217.imageshack.us/img217/602/gradient.jpg
Created attachment 33942 [details] radius example Works with nightly (minefield) and webkit.
I am unable to reproduce this bug in Safari 15.6 on macOS 12.5 and it matches with Chrome Canary 105. In case of Firefox Nightly 104, it does not have any background color issue but the radial (white inner glow inside circles) inside glow is different compared to both browsers. I am not sure, whether it is Firefox bug or both Safari and Chrome are wrong and should match Firefox. Just sharing updated testing information. Thanks!
<rdar://problem/97457453>