Re: [csswg-drafts] [css-sizing] Adding a 'size' shorthand for 'width'/'height'

I'd say that a single length makes the box square -- assuming 1:1 is 
the default aspect ratio that the shorthand resets to: 
100px * 200px @ 1:2 --> 50px * 200px or 50px * 100px --> 100px * 
100px.

It could also keep the current AR, hence 
100px * 200px --> 50px * 200px --> 100px * 400px.

Alas, then `width` before should do, too, i.e. 
100px * 200px @ 1:2 --> 50px * 100px --> 100px * 400px. 

Otherwise, yes `box` and `box-size` would work like other shorthand 
properties. The WG would decide the most useful and compatible 
approach.

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