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

On Tue, May 10, 2016 at 2:48 AM, Yves Lafon <> wrote:
>> On 09 May 2016, at 18:18, Tab Atkins Jr. <> wrote:
>> On Mon, May 9, 2016 at 9:04 AM, Yves Lafon <> 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.


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