[css-images-4] Should gradients even interpolate?

[tabatkins]

In Images 4, smart interpolation of gradients is defined: https://drafts.csswg.org/css-images-4/#interpolating-gradients. This spec text has been around for several years, but afaik has never been implemented; browsers instead just interpolate gradients as generic images (cross-fading them).

We just agreed (in #1332 (comment)) to add easing functions as <color-stop-hint>s, which would involve some more involved edits here - we'll have to define how to interpolate easing functions. That's not a difficult thing, but it's still work, and if UAs don't expect to actually implement smart gradient interpolation, I'd rather avoid doing that.

So, question to implementors: is there any intention to actually implement the smart gradient interpolation? Or should we give up on it and define that gradients interpolate as generic images?

(tagging @dino because they brought it up in the call)

[dlibby-]

Tagging @ogerchikov as well, her team has looked into adding support for this to Chromium in the past. I'm not sure the current status though.