Re: [css3-transitions] shorthand/longhand handling in transition property

On Oct 22, 2010, at 3:04 PM, Sylvain Galineau wrote:

> The current Editor's Draft [1] defines both the following rules:
> 
> # If one of the identifiers listed is a shorthand property, implementations 
> # must start transitions for any of its longhand sub-properties that are animatable, 
> # using the duration, delay, and timing function at the index corresponding to the 
> # shorthand. 
> 
> # If a property is specified multiple times in the value of 'transition-property' 
> # (either on its own or via a shorthand that contains it), then the transition that
> # starts uses the duration, delay, and timing function at the index corresponding to 
> # the last occurrence of the property.
> 
> What seems undefined is whether the following results in a duplicate:
> 
> transition-property: border-width, border-right-width;
> transition-duration: 3s, 1s;
> 
> In other words, should this be equivalent to (a):
> 
> transition-property: border-top-width, border-bottom-width, border-left-width, border-right-width;
> transition-duration: 3s, 3s, 3s, 1s;
> 
> Or (b):
> 
> transition-property: border-top-width, border-right-width, border-bottom-width, border-left-width, border-right-width;
> transition-duration: 3s, 3s, 3s, 3s, 1s;


Agreed that the spec needs to clarify this, and behavior (b) probably makes most sense.

Simon