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

From: Shane Stephens <shans@google.com>
Date: Sun, 23 Jun 2013 12:32:02 +1000
Message-ID: <CAGTfzwSPLUCpbpF1nVvwBEGmDqHm8mN1=zSJLDcB8L6361Lfag@mail.gmail.com>
To: Jon Ronnenberg <jon.ronnenberg@gmail.com>
Cc: www-style list <www-style@w3.org>
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 02:32:29 UTC

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