[css-images-3] Interpolating A with cross-fade(p% A, B)

[LeaVerou]

Based on the currently proposed cross-fade() interpolation algorithm, the titular example would produce something like cross-fade(x% A, cross-fade(p% A, B)), x∈[0, 100].

It seems far more sensible to promote the first operand to cross-fade(100% A, B) so that it can be interpolated by just the percentage (cross-fade(x% A, B), x∈[p, 100]), which avoids redundant nesting.

Note that Chrome currently doesn't seem to handle this at all: http://dabblet.com/gist/efb891a971d4255e4a21bad677e4780c

[astearns]

@LeaVerou should this go on the weekly agenda, since we didn't get to it at the F@F meeting?

[atanassov]

This issue seems to be already resolved by our Sydney f2f discussion on issue 2853 (see https://lists.w3.org/Archives/Public/www-style/2018Jul/0024.html)

[tabatkins]

Yeah, we addressed it during the F2F. Just needs edits. Retagging to the correct spec, too.