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DC [css-values-4] mix() can not represent retargeted transitions · Issue #9341 · w3c/csswg-drafts · GitHub
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[css-values-4] mix() can not represent retargeted transitions #9341

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andruud opened this issue Sep 12, 2023 · 5 comments
Closed

[css-values-4] mix() can not represent retargeted transitions #9341

andruud opened this issue Sep 12, 2023 · 5 comments
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Closed Accepted by Editor Discretion css-values-5

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@andruud
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andruud commented Sep 12, 2023

Say you are transitioning from A to B, and then in the middle of that transition, you retarget to C. If the interpolated values can only be represented with mix(), then we'd have mix(mix(A; B; x%); C; y%), which isn't valid.

Can we drop the weird "must be the sole value" and actually give mix() a type?

Note: See w3c/css-houdini-drafts#425 for a real example of something that can be transitioned, but not represented.
@andruud andruud added the css-values-4 Current Work label Sep 12, 2023
This was referenced Sep 12, 2023
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@Loirooriol
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I think that these functions which accept a list of values and behave as one of them should allow the individual values to be things that would normally require to be the sole value.

@tabatkins
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Yes, I haven't gotten around to specifying this correctly, but it really should be written as something like <top-level-value>, which is only allowed in places that explicitly allow it (such as in mix() or as the sole value of a property.

@tabatkins tabatkins added css-values-5 and removed css-values-4 Current Work labels Oct 23, 2023
tabatkins added a commit that referenced this issue Nov 3, 2023
@tabatkins
[css-values-5] Define <whole-value>, make toggle() and mix() use it. #…
46b0c7d 
…9341
@tabatkins
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Okay, defined <whole-value> and switched mix() and toggle() to using it.

@Loirooriol
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@tabatkins You forgot to replace some <declaration-value>:

csswg-drafts/css-values-5/Overview.bs

Line 419 in 46b0c7d

interpolates between the first <<declaration-value>> (its [=mix start value=])

csswg-drafts/css-values-5/Overview.bs

Line 420 in 46b0c7d

and the second <<declaration-value>> (its [=mix end value=]).

csswg-drafts/css-values-5/Overview.bs

Line 430 in 46b0c7d

if the two <<declaration-value>>s being interpolated by ''mix()''

csswg-drafts/css-values-5/Overview.bs

Line 441 in 46b0c7d

and its <<declaration-value>>s (if provided)

tabatkins added a commit that referenced this issue Nov 3, 2023
@tabatkins
[css-values-5][editorial] Fix some lingering <declaration-value> refe…
d24a6cf 
…rences. #9341
@tabatkins
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Ah thanks, fixed.

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