Re: [css-values] range-checking, calc(-5), and serialization

On Tue, Feb 16, 2016 at 3:43 PM, fantasai <> wrote:
> The definition for calc() states:
>  # The value resulting from an expression must be clamped to the
>  # range allowed in the target context.
> There's a few issues with this...
> Issue 1:
>   It doesn't state when this is clamped. Presumably the used value is
> clamped.
>   Assuming everyone agrees, I'll update the spec to say so.
> Issue 2:
>   This presumably means that ''width: calc(-5px)'' is valid, and treated as
> zero.
>   However, the serialization rules recently added to the spec state that
>     # If the result is a single value, serialize as that value,
>     # discarding the calc() wrapper.
>   This means that some calc() values will not be round-trippable.

Issue 2 is only an issue because of your suggested resolution for
Issue 1.  If the clamping happens "as soon as possible", then the
serialization rules would produce a "0" in that case.


Received on Tuesday, 16 February 2016 23:53:55 UTC