Re: [css3-values][css3-speech] dB & calc()

On Tue, May 10, 2016 at 2:48 AM, Yves Lafon <ylafon@w3.org> wrote:
>> On 09 May 2016, at 18:18, Tab Atkins Jr. <jackalmage@gmail.com> wrote:
>> On Mon, May 9, 2016 at 9:04 AM, Yves Lafon <ylafon@w3.org> wrote:
>>> Hi,
>>> In CSS2015 [1], there is a link to css3-values and css3-speech
>>> In css3-speech, voice-volume defines a new unit, dB [2], and this
>>> to the following questions:
>>>
>>> Why isn’t dB in css3-values ?
>>
>> Not all units go in V&U; we put things there when they're generally
>> applicable across specifications.  <volume> is currently only used in
>> one spot, so there hasn't been much call for it to be put in a more
>> general spec.
>>
>> (This isn't a hard-and-fast rule; <frequency> is only used in one spot
>> too, but it was part of CSS 2.1 so we went ahead and put it into V&U.)
>
> Ok, fair enough. I tried to find numbers for the implementations of aural CSS
> in CSS 2.1 and css3-speech, but failed to find informations.

Aural never attracted implementations. I dunno who, if any, does Speech.

>>> Why calc() can’t apply to dB (as currently written in css3-values)
>>> Is 0 an acceptable value for 0dB like for other units ?
>>> Thanks,
>>
>> It hasn't been specced to do so yet, but we could if necessary.  Since
>> there are no other <volume> units, right now the only thing you could
>> do with it is write out fractions rather than expanding it into
>> harder-to-read decimal expressions.
>
> Yes, or increment with percentages, if applicable.

None of the places where it shows up allow percentages, so that's not
valid anyway. ^_^

> On another topic (CSS Snapshot 2015), are SVG-related CSS properties considered out of CSS ?
> There are no mention of them in CSS2015.

They're maintained outside of the CSSWG (by the SVGWG), so we're not
currently including them in our Snapshots.

~TJ

Received on Tuesday, 10 May 2016 17:40:26 UTC