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This all gets interesting when mixing sRGB, Display-p3 or Lab colors in gradients and animations. There's an open issue about it at W3C: https://github.com/w3c/csswg-drafts/issues/4647

I think Safari currently fails to display such gradients.

I made an sRGB to Display-P3 gradient and it worked well for me in Safari: https://codepen.io/NV/pen/GRJvYzQ.

You are right! I had tried it in SVG, where solid P3 works, but gradient P3 fails: https://jsfiddle.net/6pL12ct0/