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[css-values-4] Allow omitting <declaration-value> in mix() #8556
Description
If I am not mistaken, mix() is valid for custom properties, whose initial value is the guaranteed-invalid value, ie. an omitted value.
A
mix()notation is invalid if either of its<declaration-value>s are invalid when interpreted as a whole value for the property the function is used in, or if the property using it is not animatable.
Should mix() syntax allow omitting <declaration-value> ...
- <mix()> = mix( <percentage> ';' <declaration-value> ';' <declaration-value> )
+ <mix()> = mix( <percentage> ';' <declaration-value>? ';' <declaration-value>? )... to accept inputs like --custom: mix(50%; ; on)?
Activity
Loirooriol commentedon Mar 10, 2023
In fact
mix(50%; ; on)is using a space so that's already a<declaration-value>I think? Omitting it would allowmix(50%;; on)I guess.tabatkins commentedon Mar 10, 2023
Yes, passing a space does indeed satisfy
<declaration-value>, but I should indeed go ahead and give it?since that's also a valid custom property value.[css-values-4] Fully omitting a mix() argument is fine (you don't nee…