[css-transforms-2] individual transform properties should have default value of 'none'.

[shans]

.. and non-none values should establish a stacking context & containing block for consistency with transforms 1.

Spec link: https://drafts.csswg.org/css-transforms-2/#individual-transforms

[shans]

email from Matt Rakow:

"Hi all,

Any non-"none" value for the transform property causes the element to establish a stacking context and containing block. The individual transform properties are not currently specified as establishing either of these; should they (I think yes)?

If yes, when? Do these properties also need a "none" value as the default?

Thanks,
-Matt"

[shans]

Having a default 'none' (and every other value establishing a stacking context) is probably best so that animations that sweep through the zeroes (translate: 0px, rotate: 0deg, and scale: 1) don't pop in and out of stacking context/containing block.

[ChumpChief]

I support the addition of a "none" value as the default for each of these properties. More discussion at:
http://lists.w3.org/Archives/Public/www-style/2016Jun/0170.html
http://lists.w3.org/Archives/Public/www-style/2016Jun/0171.html