Re: [fxtf-drafts] [css-transforms-2] How to serialize `scale` if we only use one number?

> Sigh. That's a Chrome bug. `2 2 1` does indeed signal a 3d transform, which has side-effects and is not equivalent to `2 2`.

@tabatkins Sorry to ask the question here, but I still want to know why the 3d transform has the side-effects and not equal to the 2d?
e.g.
`translate: 10px 10px 0px` vs `translate: 10px 10px`, and
`scale: 2 2 1` vs `scale: 2 2`,
I thought they are the same, but as you mentioned, the 3d version is actually different and has side-effects. Would you mind to give me more explanation or is there any reference? Thank you very much.

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