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RE: [css3-transitions] Transitions from display:none

From: Sylvain Galineau <sylvaing@microsoft.com>
Date: Tue, 17 Jan 2012 00:00:14 +0000
To: Lea Verou <leaverou@gmail.com>
CC: Øyvind Stenhaug <oyvinds@opera.com>, "www-style@w3.org" <www-style@w3.org>
Message-ID: <3C4041FF83E1E04A986B6DC50F01782903401442@TK5EX14MBXC296.redmond.corp.microsoft.com>

[Lea Verou:]
> 
> On 17/1/12 01:12, Sylvain Galineau wrote:
> > [Lea Verou:]
> >> On 13/12/11 18:43, Øyvind Stenhaug wrote:
> >>> Hi,
> >>>
> >>> I see it was resolved at TPAC that "CSS animations do not start or
> >>> continue running on elements that are display:none or inside
> >>> display:none elements"
> >>> (<http://lists.w3.org/Archives/Public/www-style/2011Nov/0709.html>).
> >>>
> >>> However, transitions need to be considered too, and I couldn't find
> >>> a similar issue reported on the list. And even if the transitions
> >>> spec were to get some similar wording, it would be necessary to
> >>> define in what order simultaneous style changes are considered to
> >>> happen for this purpose. This also seems somewhat connected with the
> >>> plans to make all properties interpolable.
> >>>
> >>> For instance, one might expect margin-left to transition in this
> >>> case (and maybe especially so if 'display' were to be interpolated
> >>> similarly to 'visibility'):
> >>>
> >>> #test { transition-duration: 0.5s; } #test.before { display: none;
> >>> margin-left: 100px; } #test.after {
> >>> display: block; margin-left: 0px; }
> >>>
> >>> However, we have already seen a case relying on the opposite, and
> >>> thus looking buggy in Opera.
> >>>
> >> Why not handle all non-interpolable values like visibility and
> >> interpolate them through a discrete step?
> > What are 'all non-interpolable values like visibility'? We should be
> > specific as to which cases we want to talk about as there are far more
> > that just can't really be reasonably defined.
> >
> >
> I was referring to every value for which interpolation isn't explicitly
> defined. Roughly anything that's not a number, integer, percentage, length,
> angle, time, color, image (in L4) or a functional notation with parameters
> of these types. Basically, as a fallback kind of interpolation definition,
> when there's nothing more specific. I never got what was so special about
> visibility and it was the only property that got that privileged treatment.
> 
Sorry, I'm slow so I don't understand what that means. Let's start with
visibility; it has values of hidden, visible and collapse. Where does collapse
fit in when I interpolate from hidden to visible? Does it happen somewhere in
 between? Or are we talking about interpolating between any pairs of value with
the author deciding when the switch occurs?

Received on Tuesday, 17 January 2012 00:00:39 GMT

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