Re: [csswg-drafts] [css-multicol] the minimum and preferred width of a multicol is not defined anywhere

Yup, looks like this is well-defined now (and results in Firefox's 
behavior).  

* min-content size is the larger of its column-width and the largest 
width of its inline content; in this case, that is `100px`.
* fit-content is just the normal algorithm: max-content size (here `10
 * 100px`) clamped by min-content size (`100px`) and available space.
  The multicol filling algorithm then decides how many columns to put 
into that area (here `floor(screen-width / 100px, 100px)`, probably 4 
or 5)

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