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Re: transition using matrix to/from zero values can not be decomposed

From: Jon Ronnenberg <jon.ronnenberg@gmail.com>
Date: Sun, 23 Jun 2013 12:38:36 +0200
Message-ID: <CAPEZGVs=U5-JrOdptdsfKawM55tQTPkUdmJym-1QaxbGnH5fdA@mail.gmail.com>
To: Rik Cabanier <cabanier@gmail.com>
Cc: Shane Stephens <shans@google.com>, www-style list <www-style@w3.org>
Thank you both. I didn't think of using scaleY but it's perfect in this
use-case <http://jsfiddle.net/dotnetCarpenter/PhyQc/8/>.

Still, I believe there exist further corner cases where it's desirable to
animate to/from zero values, using a matrix. Shouldn't the spec matrix
interpolation handle such cases?


On Sun, Jun 23, 2013 at 4:58 AM, Rik Cabanier <cabanier@gmail.com> wrote:

> yes,
> in general it's much better to use the other transform function than a
> matrix. Matrix interpolation was added for completeness but you shouldn't
> really be using it.
>
> The current matrix decomposition logic also only matches Chrome at the
> moment. Both Safari and Firefox will use different interpolation logic so
> your animation might look different.
>
>
> On Sat, Jun 22, 2013 at 7:32 PM, Shane Stephens <shans@google.com> wrote:
>
>>
>> On Jun 23, 2013 11:48 AM, "Jon Ronnenberg" <jon.ronnenberg@gmail.com>
>> wrote:
>> >
>> > According to Decomposing the Matrix, transitions from matrix(1, 0, 0,
>> 0, 0, 0) to matrix(1, 0, 0, 1, 0, 0) is not possible. This simple transform
>> is saying an element is zero units high and will become it's full height.
>> Imagine a slide-down animation.
>> >
>> > Due to this, browser vendors can not "fix" this without violating the
>> specs and web authors have to work around this limitation by using
>> max-height transitions with guessed maximum height or revert to use
>> javascript.
>>
>> That may be true with regards to browser vendors, but web authors can use
>> the much simpler work around of transitioning scaleY.
>>
>> Cheers,
>>     - Shane
>>
>> > I'm not sure if this is a documentation bug or a spec omission. But I
>> sincerely hope that this is not the intended behavior.
>> >
>> > It should be said that all browsers that supports transform transitions
>> can animate from matrix(1, 0, 0, 0.0001, 0, 0) to matrix(1, 0, 0, 1, 0, 0).
>> Webkit does however leave a 1px artifact instead of hiding the element
>> completely.
>> >
>> > Cheers, Jon
>>
>
>
Received on Sunday, 23 June 2013 10:39:03 UTC

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