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Re: [css-background] Animating border-position

From: fantasai <fantasai.lists@inkedblade.net>
Date: Wed, 18 Dec 2013 15:53:19 -0800
Message-ID: <52B2356F.4000107@inkedblade.net>
To: "Tab Atkins Jr." <jackalmage@gmail.com>
CC: www-style list <www-style@w3.org>, "L. David Baron" <dbaron@dbaron.org>
On 12/17/2013 06:23 PM, Tab Atkins Jr. wrote:
> On Tue, Dec 17, 2013 at 5:43 PM, Tab Atkins Jr. <jackalmage@gmail.com> wrote:
>> On Tue, Dec 17, 2013 at 4:21 PM, fantasai <fantasai.lists@inkedblade.net> wrote:
>>> On 12/17/2013 03:32 PM, Tab Atkins Jr. wrote:
>>>> However, as established by FF, we can at least convert values on
>>>> opposite sides of the same axis into each other, if we establish that
>>>> <percentage> can be preserved as a top-level type in a calc() in some
>>>> cases, which we should do.  (I'm fiddling with V&U right now to allow
>>>> it.  It's tricky to spec.)
>>>
>>> I'm confused as to why you think V&U needs changes.
>>
>> Because right now calc() specifies that a <percentage> resolves into a
>> <length> (or whatever), but for <position> to work right, we need to
>> preserve its percentage-ness.
>
> Never mind, turns out we'd already added a paragraph that specifies
> this.  I just added a clarifying example to make sure it stands out,
> using background-position directly.
>
> We just need to adjust how <position> is transitioned, and can
> probably go do that in the Transitions spec.

I've updated the spec's Computed Value line to be
   | A list, each item consisting of: a pair of offsets (horizontal
   | and vertical) from the top left origin each given as a
   | combination of an absolute length and a percentage.

I think in combination with dbaron's text for the Animatable line,
this should be sufficient. (Though dbaron might have some suggestions
for wording improvement...)

~fantasai
Received on Wednesday, 18 December 2013 23:53:50 UTC

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